my fave mod is the air conditioning in my hard top
Ooohhh, I hear it's pretty easy to do on the trail as well!
Not enough experience to say too much, as I've only had the Jeep for 6 months now, but around town the "upgraded" speakers (I threw in some cheap pioneers) are nice.
On the trails I've had to use the lockers here and there...sometimes I turn them on when I could probably pass the obstacle without them though
Ooohh, and the best winter mod by far was the ski rack added to the safari rack