4A-GE 20V would be ok, they are relatively new. If you want to be crazy, get a blacktop, high revving engine, with slightly more power than the silvertop, should be alot easier than a 5S-FE.
All the A series:
4A-GE
4A-GZE - Supercharged
7A-FE - 1.8L
Or turbo your 4A-FE.
My friend at CorollaCustomZ had a 5S-GTE in the Corolla, lots of work and lots of fun
All the above will need ECU and wiring harness.