Couple choices.
Eventually you'll have to go to a RE Hack & Tap with a new Drive Shaft or a SYE and a new Drive Shaft.
Currently, after doing my RE6130 4.5" lift on my '96 Cherokee, I just went with 4* Shims & a Transfer Case drop. I have minimal vibrations, but will be going to a Hack & Tap before I do any serious offroading or flexing.
Hack & Taps from what I hear on multiple forums, are fine for the types of off roading most of us do. Just remember with the H&T you simply shorten a stock tailshaft, where a conversion kit provides you with a new larger diameter tail shaft.
Difference in price, Hack & Tap '95 and under ~$180.00 + Driveshaft @ ~$250.00. Hack & Tap '96 and newer~$80.00 + driveshaft @ ~$250.00
SYE, anywhere from $275.00 - $350.00 + Driveshaft @ ~$250.00