yikes, should have bought my friends r32 rb25det few months back would u want it to be able to be driven on the street or for track only?
either way im sure you could easily find a nicely 'already modified' skyline, silvia, 180, or s14 for that much money all ready to go nothing more to pay (except tyres)
basically the way it should work for around 10k+ is the older the model the car the more modified it should be, ie an R32 or s13 for sale at 14k would have to be built or atleast have a big turbo slapped on the side with some good suspension, rims, ecu etc as opposed to an s14/s15 or r34 at 14k would be less modified or not modified at all.
you dont have to stick with nissan either, you can look at mazda rx7, toyota, people drift all sorts of cars, you cant really say this car is better than that one, some people say 4 door cars are better some say 2 doors.
its just personal choice
tho usually for a beginner you want to start off with something with just some good suspension setup an lsd diff and not crazy power