options?

I was just wondering what are my options for axle swaps I know the d44 the ford 8.8 the chrysler 8.25 but what else is there and also what are my options for a part time locker in the rear: electrac detroit locker arb locker (what size compressor will i need?) also if any of you have experience with controlled lockers what do you think? is it worth the extra money for one in the rear? thanx.

There is one hell of a good sticky at the top that covers many of the common and a few not so common axle out there. As well as gearing for said axles.
Don't forget just getting a tape and start crawling under rigs. Heavy duty rigs with big or diesel motors are good donors (in most cases).