I had the same question when I was deciding what car to buy - 32GT-R, 32 sedan or 34 sedan.
My decision ended up being influenced by the fact that:
* I wanna be able to leave my car ANYWHERE when I go out and not have to worry about it too much;
* I want minimal hassles from other road users, who can tend to be aggressive when they see a Skyline; and
* I want minimal hassles from the cops...
Buying a GT-R pretty much rules out parking on the street when you go out, and buying a Skyline can sometimes make you a target for the dickhead factor, or cops on an ego trip...
I like the fact that my car is pretty sleeper-ish, and the only things I'll do to it visually are wheels and lowering, and maybe a rear spoiler for somewhere to mount a camera. I'm pretty sure the loudness of the exhaust is borderline, but cops barely give me a second glance!