If you've got a money tree the possibilities are endless.
The smart choice is 4AGZE or 20v if you want the least amount of hassles and the most bang for your buck.
KEB11N on Toymods has a GZE powered one. I saw his and found out more about them and bought mine and put a S/T 20v into it. Has been my daily driver and snow and back hack for almost 6 months now and hasn't missed a beat.
Excuse the crappy photo
Kevin's car and how awesome they can look with a 2 tone paint job, dark tints, dropped (his is on bags) with rims.
I'd recommend going and signing up with a few different sites (toymods, twincam.org etc) and searching searching searching.