Firstly he needs to decide whether he wants a R32, R33, R34.
Well, actually budget should be first.
£10k will get you a R32 GTR, or a R33 GTR, or a R34 GTT. £25k will get you an R34GTR.
I would recommend importing a fresh example that hasn't seen UK roads. JM-Imports or Torque-GT would be...