it depends what you want to do with it. from my experiances the best handleing car ive ever driven was a rx7 so good, i bought it on the spot. u can get single turbo converted ones with good history and a rebuild for less than that budget. They sound fantastic aswel, i really rate them and ive owned alot of sports cars.

http://www.youtube.com/watch?v=5q9A10_XJS0 this ones for sale and he wants 6k for it.

if i had that money i would be looking at this one http://www.pistonheads.com/SALES/1382909.htm
and this one.
http://www.pistonheads.com/SALES/1382266.htm