If you got a GTR then why the heck are you going with a staggered offset ? It will ruin your AWD system.
Secondly, the offset you mention is crap as as it will scrap and would look wrong on a GTR, go with +9.5 or +10 + 12 or +15. With tires at least go 265 like many have suggested or even go 275. I have 19+9.5+12 and run 275 tires. Looks so much better.