Yeap ive owned an R34 GTT and got bord of the power. much more reliable and easier on the eye, got respect from old people, RWD, but nothing on my R32 GTR i have now. So much more power, much more fun to drive with the 4WD and gains more respect from skyline fans a like.
It all depends on what you want out of a car, if you want a styley powerful reliable sports car get a GTT, but if you want a tough classic super car get a GTR. When i had my gtt i was happy with it, but i knew it wasnt a gtr, and i wanted a weapon, so got a gtr.
good luck man!