I'd go for the Vette. I'm not a Corvette fan by any means but it's hard to beat the price vs. fun factor of those cars. When the C-5 released, it beat the piss out of much more expensive European and Japanese cars in almost every major test (acceleration, slalom, etc) and especially the NSX, which was twice the price and lost to the C-5 in every category.
GM has done some amazing things with pushrod engines. The Corvette, while far from my favorite car, is hard to ignore when you look at its price and performance. In the sports car world, it's one of the best deals out there. Plus, the car has one of the largest following in all of the industry. Should you ever want to change out parts or work on the car yourself, there are a million sources to go to for information and thousands of companies making aftermarket parts for the car.