Everyone's opinion for rear end to go with?

I agree with what most everyone has said here. I would not bother with an 8 3/4" (with anything really, besides a stock streetcar). The strange S60 housing is also lighter than a factory D60 housing.
Depending on brakes and axles you choose, add your choice of car housing ends (not floater) and you'd be good to go with that combo for quite some time.