5.7 Hemi Conversions - XVMotors? Arrington Chip Killr? Other options?

I really do like the idea of having a new 5.7/6.1 Hemi in an older muscle car. But I guess I am biased because I have a 408 stroker sitting in my room, and thats what I would use...Much easier and cheaper to go with an aluminum headed 408...But, FWIW, sometime in my lifetime, I will have a gen III hemi in my ride. I do like the chipkiller idea, I think it would cure alot of the computer and wiring hassles. But, I am cool with either way...