I was thinking about that, and it's true that if there aren't many on the market, it's probably not a good idea to buy one.
I've been looking at the power figures for some of the S2k's, and it seems they lack torque. Even the high powered ones. One of the 700bhp cars had 460lbs/ft. I've got a Fiat Coupe running 350bhp and 305lbs/ft, and if I forged my engine and went with a bigger turbo and better headwork, I'd be close to 500bhp with the same amount of torque!
I wonder weather it's not better to spend the money on my own car or go for a Supra instead!