Datfun I used a 10" honda disc with the hilux 4spot (cast) callipers. They worked great even on the race track. But the faster you go the better your brakes should be
Sarav looking at the specs both the gtr and gts-t rotors should work. you will have to drill the center hole out a bit to fit to rear of hub instead of front and drill 4 new holes to bolt it up it wont affect your track any as the rims just bolt to the hub as normal. You will have to machine the rear of hub down so teh rotor sits closer to the front for clearance and calliper position. Its all trial and error.
I bought a kit that attached them to the front of hub with big spacers ect finding a rim to clear oit all was a nightmare so I just made it up to suit my own liking. Its good having a freind with a machine shop :)
Cheers Andrew