Personally, I'd aim at the JZA80 if you want a car to thrash around.
The 2J is a damn near bullet proof motor, plus larger capacity. (Think if you want 3.0L in the R34 you need to build a custom motor)
Plus get one with the V160, you have a gearbox, that's being proven to handle 1000HP. (700RWKW) and keep running day in, day out.
Sexy looks (Personaly, I like the JZA80 over the R34)
Plus you get all the coolness of having the ORIGINAL TF&TF car...
Plus if you ask someone how much there car is retail you'll be able to smoke em...
Oh, and $15G over night from Japan, it'll decimate all...
If you didn't realise, the last few lines were just a shit stir (After the sexy looks line)
Personally, I'd go the JZA80, but from what I've seen, the R34 has more rear leg room.