I'm not sure you will be happy with a 2.5" lift. That may be all you think you need now, but eventually you will wish that you had gone 4".
The biggest drawback to the 4" lift is you almost have to do a Slip Yoke Eliminator (SYE), and CV driveshaft at the same time.
If you only want to spend money on a lift once, I recommend the Rubicon Express 4.5" Extreme Duty. This lift has a decent highway ride and good flex on the trail. The kit seems expensive, but it is very complete, with no extras to buy. A lot of the cheap kits are not complete.
I've heard good things about the Superlift 3.5" kit too, but no personal experience with it.
91YJ Sahara, SOA, 4.88's, 35's, Locked