I'm not sure, but i think it comes in all the same colors as the Speed 6. I have a reflex spice and a chameleon blue Speed 12. It's an awesome car, it's fast, it's got handling,and it looks great. it's a little heavy though
The Speed 12 is on display at the TVR section of the Car Dealer, so you can check all the colors there.
The best basic advice I can give you is to use a light foot in the lower half of the gearbox, the car will be smoking it's rear wheels right up through 3rd gear. It'll take some special attention to get it from "stupid fast" to "competitive fast", but it was succesfully tamed in GT2 so I'm sure it can be done now as well.
After messing with this car after I got it, the first things that I set for it were the LSD, chamber, toe, and spring rates. after doing that with an hour of work, I finally got the car able to race. can't wait to get home tonight to run it