On AC, I had been thinking that too. Maybe AC and 4:88 gearing with the 31s I have now. But more likely the 4:88 gearing. Once I do, my Jeep could forever be sitting on 31s, since i'll get used to the driveability with the 4:88s.
By the next tire change, I might just stick with 31s for my existing Jeep, then buy a second jeep -- maybe a 4.0 YJ or TJ 5spd that's already built to run with 33s or 35s.