Ok, While I simply love Rx7s and must applaud a nemt post
with his mention of the Fairlady Z, I dont think a powerful RWD car is a good choice as an only car in Minn. I know it's not in maine.
Some sporty cars that may not seem overly sporty to your parents.......
Any VW with VR6. available in GTIs, Jettas, Passats, and Corrados.
Pontiac GTP. 4 doors. it cant be fast.
A 4 door integra GSR is a decent choice.
The Mazda MP3 is supposed to be pretty nimble. Not sure on Prices.
A Focus ZX3, or the PZEV focus would be decent.
Mainly keep your eyes open on deals that are local and test drive things to get a feel for what you like.
As far as Subies, even an a 2.5RS is decent. And can be upgraded.
I've seen older Quattros cheap.