i havent had much trouble with my Wanli's, they just are a harder compound therefore last longer, but im saying if u go cheap, Wanlis and Hero (which Madaz is running) are probably the lowest you should go. Hero's are made by Federal, so they cant be that bad.
just called Nissan, i asked for one to suit a 96 GTS-t, not sure if they differ at all, but they guy said no one keeps them, so your looking at $196 from Japan.
Legnum - twin turbo AWD, import for 13k and under
Stagea - Single turbo RWD/AWD - import for 12-16g, or twin turbo AWD for 16g and a bit over
I say Stagea
lol, pm Rad32 and Ryan Rb25, they will tell you everything you need to know, Adrian has recently done the conversion and Ryan is your man for the exact procedure and parts needed.