I looked into the 3S-GTE today by going round a few importers.
Problem is my is a 96 model, so to get it legal would require either a Celica ST205, late SW20 MR20 , or Caldina ST215 3S. (Plus I don't want to put an older motor in).
These cost at least $4000 (or $6000 if you shop at SSS), whereas I could get an '01 1MZ with wiring for less than $2000.
I'm still trying to see if a GT4 box will fit the V6 (the problem is going to be the rear exhaust).
If I go 4wd (which I want to do) this will probably add another $1000, plus a GT4 box, plus a 4wd fuel tank (which looks like I'll have to get from NZ).
I'd like to get an ST205 box, but this can prolly wait till funds allow.
I've also heard of someone turbo'ing the 1MZ, so that would be really sweet.