you could re gear the front, and add alloy shafts, then buy a comlete ready to blot in Dana44 from 4wheelersupply.com with you choice of locker, shafts, breaks, and u joint. or find a ford 8.8 out of an explorer, and just ad TJ brackets and re-gear. the 8.8s are cheap, and come with disc breaks on the newer ones.
im in the same boat as you, im running a 35 in the rear and just moved up to 33s and im thinking of what im going to do in the rear so i can jump to 35s or 37s next year.