i have had a gx71 for a few months as my daily. i chucked on my lenso rs5s and .. customised the springs. looks staunch, gets alot of looks and was the only 1 i knew of. a couple popping up here an there. the 1ge is a bag of shit compared to an rb20e but its not to bad on gas. mines auto, central locking, electric windows, blah blah blah. scored it for $200, NZ new with a mad blown head gaskets, so i scored a motor for $300 an chucked that in an havnt had a whisper from it since then. purr's away, starts first pop every time. as for parts, i kno of a few wrecks around tho they arent to hard to find parts for.
as for modifications, as mentions a 1ggte or 7mgte wont b hard to bolt in (maybe a swap of X-member etc) the rear end is the same as the mk3 supras and u can bolt the big daddy LSD's out of them into it.
as for me, once my ke30 has been off loaded to sum lucky punk im gunna grab a 1uzfe (lexus V8) build a set of manifolds, chuck on a set of T3 turbos and 45mm external wastegates an a link plus ecu an abit of head work an let the fun come