Okay, I'm done now, probably;
In approximate order of increasing insanity.
-Lamborghini Murcielago '5 (Chiarro Blue): With the wheels from the roadster. And, probably a turbo. Or something.
-'0 BMW 740i + sport package (black): With the 750's V12 swapped in. Sprinkled with carbon fiber bits and various electronic goodies (GPS, ninety thousand volts of security system, stupidly nice stereo, etc).
Basically, the whole crazy tuner bit. Like someone got halfway through making an M7, but then threw in a bunch of luxury goodies instead of stiffening up the suspention a little more, and then made the engine more powerfull again to make up for it.
-Dmitri Parfjenov T-98 combat Hi.Pro.S (in 4-door truck configuration, not wagon) (black again): For those not obsessed with this demented monstrosity that looks more like it came from planet Cybertron then St. Petersburg; "Hi.Pro.S" means it's rocketproof.

While I'm at it (being insane, that is), all that armour must weigh a whole lot, so I'll swap out the 5.7 liter Vortech for an LS7.
-'69 Dodge Charger R/T (black with white 'bumblebee' stripe): Okay, maybe this list is looking a little monotone so far, but I just want to keep this one far far away from Hemi Orange. While I'm avoiding things hemispherical, it is a very nice engine, but I'm crazy. I'd swap in a Heffner built twin turbo Viper engine. With Heffners's engine management, the top spec engine can be more streetable
and more powerfull then SVS Stryker or Hennessy TT. So I hear, anyway.
As for hearing things, the incomperable sound of the twin turbo V10 would be vented out big fat chrome pipes running along under the doors and exiting in front of the rear wheels in the style of Cobras, Corvette Stingrays, Vipers, etc.
Nonconformist as the engine choice may be, I don't think I can do better for the wheels then AR Torq Thrusts (black, /w polished lip).
-Nissan Skyline GT-R R34 (Marine Blue, same as
GTR-700): This was a tough one. Not picking a Skyline over something else, but picking a generation

. Stock, I don't really like the looks of R34s, but
this bodykit (I can't figure out if the modelers made it up) is the best I've seen. I think it would mix very well with some
Speedline 1908s. I don't know what it is about those, but they're on almost every Skyline I've got in GT3.
Given those mods (widebody
and a giant wing), I think it would take a good six or seven hundred horsepower to not make a ricer out of me. I wouldn't want those to go to waste hauling silly things like rear seats or stereo equipment, either. The car would have a very sparse interior. Not 'race car stripped', just a minimum of bloat, like a Lotus.
-Toyota Baja race truck prerunner (black with green flames): As my information goes a 'prerunner' is what they use to recon the area before hand. Same engine and suspension as the full race truck, but with such niceties as air conditioning, and a windshield. As this is a racing truck, it's likely that some silly governing body has forced it's draconian rules on it. Like 'the engine has to suck all it's air through this little hole here', or 'no turbos' or something stupid like that. Well, I don't have to listen to them.
-Cadillac Cien '2: 'Stock' is a bit of a funny word for this, given that there's only one of them, but that's how I'd like it.
...actually, I just imagined it in black, and almost died <eyes glaze over>
... Or dark metallic green, maybe cold steel blue.
Hmm, think this big mysterious envelope of funding could get me a few cans of electrochamelionic paint?
-Tatra T-815 8x8 Kolos:
Like this, but forest green (the green one there is the 813). What would I do with it? Not much. Weighs 15 tons, hauls 10, tows 100. 18 liter diesel V12, 8 wheel drive, 4 fully locking differentials. 20 forward gears, 4 reverse. What's to improve?
-'84 Toyota Celica Supra GTS: 2JZ-GTE + V160 swap (MkIV Supra engine and 6 speed transmission). Tuned to around 700hp on full boost (with appropriate drivetrain upgrades, of course). Even with the advantage of a six speed, I wouldn't want to be fighting turbo lag tooth and nail, so I'd change out the stock twin turbo system for a variable sequential twin turbo setup. Ideally, this satisfys the best of both types of turbo tuning, a small turbo provides instant response at low RPM, and a large turbo provides massive high-rev boost. In between, there's some valves and computer controlls and such. If BorgWarner can do it, so can I.

Turbos make enough of a muffler for my tastes, so I'll give them each a big straight pipe coming out on the passengers side in front of the rear wheel.
It sounds silly, but I think
Ford GT concept wheels look really great on MkII Supras. (I've got an example in GT4). The design doesn't quite fit though, so I'd have to get something custom made. The same basic design with a few tweaks would look almost
stock, albiet much wider and more accepting of big dinner plate brakes (something the stock 3000lb, 14 inch wheeled car sorely lacks). Those big wide wheels may make it hard to fit updated stiff-but-comfortable suspension in the corners as well, but 'unlimited' is a whole lot of funds. Certainly enough to reengineer the notoriously flexy unibody to more modern torsonal rigidity standards (with an integral roll cage). Possibly in carbon fiber, and certainly with matching body panels and aerodynamic undertray. The latter is rather critical. How can I keep this car on the ground at 600hp-facilitated speeds without messing with the 'under 50 polygons '80s wedge' styling I love so much? Fan assisted ground effects.
C6 'vette-like HID headlights (as to not mess with the aerodynamics at night, they can't be that good to begin with) and gimmicky sequential turn signal LED taillights ( ___ *blink* __< *blink* _<_ *blink* <__ ) round off the the details I can get into before getting boringly obsessive.
-F1 program: After spending all that cash on these cars, and the outragous modifications to them, do you think I'll just let a bottomless bank account waste away by keeping the fleet fueled, tired (rubbered?), and polished? Of course not, that would be silly. Instead, I would start my own Formula one-type program. Starting from the beginning of automotive technology, my team of ludicrously overpaid engineers and I will slowly alter, tweak, refine, and improve one car through the eras of automotive technology. We will see it evolve from a creaky puttering anachronism barely capable of self-propulsion to the fastest ever thing on however many wheels we decide are best.
Is that cheating? Maybe it is, but it's such cool cheating, who's going to argue?
-You didn't say cars, did you? What a big, glorious, cold war era, 33,000 ton, 100,000 horsepower, nuclear capable,
loophole.
Here's one with people on top. Yeah, it's big.
Can't have a garage like that and no yacht, can you? Just wouldn't be proper.
I'm not going to war with it, so I'd take out
most of the missle tubes, and a lot of the 140 person crew wouldn't be usefull anymore. It could be a very luxurious and outragously cool vessel to cruse the seas in.