I'm about to get a gear change as well. Just getting all the parts lined up. I have a 6 spd and will be rolling with 4.88s. I've got 3.21s now and I can tell u that just around town and on flat highways they are fine for power. After all it's a Jeep not a sports car. However that being said u will not like the stock gears off road!
You can't gracefully crawl over stuff and u have 0 torque when climbing steep gnarly stuff. You just can't get the engine rpm up to where it's happy in the hills. I'm sure the clutch takes a beating in the process as well!