Tough budget but I'm going to say a Mustang, preferably 99-04 because I like that body style best. Plus, they're cheap to mod if you ever get a little bit of money to play with and get bored.
Camaros/TA's, etc are out there too, but a little bit more to mod. I have owned both, a '99 z28 and a 2003 Cobra. Can't compare the two, obviously, but both were amusing cars. For $9k, a z28 or TA should be fun.
If you can find a 350z for $9k, jump on that all day, the lowest I have seen them for is maybe $15k or so....
The older M3 will be a maintenance nightmare especially since it's older, good luck to you if you want to mod it, same with an older S4 which I would stay away from, knowing they have some problems and just because they're supposedly boring cars to drive.
What is the Subaru 2 door WRX STI thing? It is kind of old but supposedly a great car, really fun. If you are into something like that, that could be something to research. I don't know my subbies though, so I'm not even sure what year to guess.
3000GT, they look dated and will it be a boring car.
Audi TT is probably cheap, as is the BMW z3, but those are sort of girly cars, unless you are a girl?
I would say a C4 Corvette, but I don't know how nice of one you'll find for that money, and they are not really nice cars to drive.
That's all I can think of right now.