The dana 30 isn't a bad axle. I'm sure somebody out there with more knowledge than myself can chime in, but you could go with a dana 44 front or a dana 60. From what I understand, there is a fair amount of fabricating required.
"Some days you eat the bear, and some days the bear eats you"
My Build: '92 YJ 4.0, AX15 with 4" RC lift, SYE, Tom Woods drive shaft, 33x12.50 Hankook Dynapro MT, 4.10's
If your staying under 35's.. upgrade the shafts in the front 30, rear swap in a ford 8.8 or dana 44.. If going big tires.. then rear 14 bolt, 10.25 ford are very cheap.. front 60 or dana 44 with rcv shafts would live for a while too.
CJ.XJ.CJ. TJ. TJ.ZJ. TJ.TJ. ZJ.ZJ.YJ. XJ
I run 35's on my xj with alloy axles locked.. front HP 30 rear 8.25. Thus upgrade the rear to a ford 8.8 or dana 44, which ever works out better for your budget slap some 4.56's or 4.88's in up grade the front to the better shafts, keep the stock shafts as back up and go have some fun.