Dude,
All the older guys here are doing is to try and give this lad some good advice. While it is true that everyone's situation is different and it is not good to generalise/sterotype, what are the chances that our friend here is different from everyone esle? I'd say the chances are less rather than more.
Personally i'd say go for a cheaper car first, say an old silvia or something. Even if you dont prang/scratch/screw up the car one way or another, at least with something cheaper and your mind at ease, you'd be able to explore the outer limits of the car and clean up your driving esp on these rwd beasts (And no please dont tell me you're good enough a driver...cos no one really is)
Let us also remember that most great race car drivers today started out on a shitbox...and they too admit that it was these pocs that taught them the most.
And remember, what ever budget you have prepared for maintence/repairs/mods etc (anything to do with the car), double it cos thats what you're actually going to spend.