hmmm well if it's your passion and dream, go for it. There are a few things that you might not have considered.
Police, expect to have a lot of attention from the police, I drive a 32gtst and haven't had too much trouble *touchwood* but there are many people on here who complain about police and modifications and their legalities ect ect ect...
insurance tends to be pretty expensive for imports, but at your age it might not be too bad.. be careful if you plan on buying an already modified car or even when doing modifications as you have to list them on your policy, and (there is much debate on this) insurance companies may refuse to pay out if your modifications are illegal.
Also, owning a skyline isn't exactly good for the bank balance as someone said.. fuel + insurance + modifications + EPA's + defects... having said that, theres no better hobby