H4 conversion is a must for TJ's and is a very inexpensive. Makes a world of difference. I did the cheap route from bus depot.com with the Bosch housings and the cheap German bulbs. Plug and play, really.
I haven't turned my fog lights on since I got them. When I do they don't help a bit. Even in the fog! The lights are great but the only thing I don't like is the cutoff seems a little too close but that can be fixed.
I just spent the $45 for the silverstar ultras and have to say I'm not impressed. I didn't expect night and day difference haha. But they don't seem to be any better then stock by my calibrated eye balls.