Id say its probably cheaper to import especially if u waant an r34 cos there are not as many here so they will cost a bit more
Roughly $35000 - $45000 for a GT
and $75000 - $90000 for a GTR imported for both prices
but u can save a lot if u take your time and search around id say talk to an importer like Prestige Motorsport and theyll b able to help u more