I love the random surprises in the UCD.
The
Mugen S2000 is a more planted version of the S2000 (only tried an EU-spec '01 model so far) and sounds nice, too. The
Spoon version is a bit too edgy and sounds a bit rough - but the sun was going down by the time I tested it, so track temperature might have been an issue.
I painted my Amuse R1 S2000
orange, it looks great.

They also do a "
Street Version", which I also have but have yet to test - I imagine it would be an interesting match for the Mugen - funny that my Spoon, Mugen and Amuse S2000s are all the same colour.
I've not really been tempted by the Altezzas, except for a nice mica green "
Gita", with the 212 bhp 3-litre straight 6. Very nice, well mannered and a strong, versatile engine - I was very surprised by this one.
I picked up a
Speed 12 the other day, and it is insane with no aids! It's crazy that you can more-or-less accelerate at the same rate up to (and including) 4th gear!

Coming out of the double-right after the flugplatz, with the rear tyres lit up in fourth was quite an experience... I think it might need some slicks.
I got a
Spoon Fit, along with the
mmR cup car to complement my
Lupo GTi cup car. The Fit is arguably the best handling of the three, but is clearly under-powered!
I really, really want a Spoon
DC2 and
EK9, and a
400R to go with my
R34 R-Tune and
R32 S-Tune.

I found the FTOs are a good match for DC2s, but a bit softer and a touch lardy - the
GP Version R is the lighter of the bunch, but the
GPX has much more character, in my opinion.
Another car I enjoyed was the
Golf R32. Again, pleasantly surprised by it; despite its weight it can just about fend off a mildly tuned DC2. In the rain, the golf has the edge thanks to its 4WD.
Racing a
Renault 5 Turbo against the
205 Turbo 16 on Côte D'Azure is great fun, the little 5 loves to drift
EDIT: That Isuzu Bellett was pretty good in GT4, not seen it crop up in GT5 yet...