mr2 Engine swap recommendations

I plan on buying an MR2 sometime in 2005. I'm curious about which engines make for good swapping in the mr2, first or second gen? (if you haven't seen the first gen mr2 with the Northstar v-8 yet, check out http:///toystar/index.asp !!) Also if I decided against an engine swap, are the new TRD superchargers at all compatible with older mr2s?