Looks, personally I'd do R33 -> R34 -> R32.
As if! R32 -> R34 -> R33
R32, R33, R34 all have RB26's so same engine unless you have a N1 block or a special edition of the R32 / R34 (unlikely but possible, Nur-spec R34's are nice ).
Yep +1. Some ppl on here have R32 GTR N1's and R34 GTR V-Spec II N1's and R34 GTR V-Spec II Nur's
Turbo wise R33 is better than R32 (slightly) although still ceramic and don't last at high boost due to ceramic wheels, R34 is better again (slightly).
Gearbox wise R32/R33 have 5 speeds, R33 Series 3 has improved synchro's R34 has a 6speed gearbox.
Cause the R33 and the R34 are newer cars so the turbos would have a bit more life left in them.
GTR's have tuff gear boxes, don't worry about it too much until you hit the 500kW mark.
Performance is R34 -> R32 -> R33, weight-wise R32 is the lightest, R34 the heaviest.
R33 is longest, R32 shortest.
+1
Brakes R33 GTR -> R32 GTR, R34 is probably better again but I'm unsure.
I would say R34 GTR -> R33 GTR -> R32 GTR. Each model did come with Brembos, but with the R32 GTR, only the N1, V-Spec and V-Spec II's came with Brembos.
V-specs have stiffer factory suspension and active (viscous) LSD's non-V-spec don't.
+1
Most modifications are illegal, depends on state.
No not really. Depends what you put on.
Cool!