Welcome to the club!
For headlights, it is best to stick with the factory option. The reflectors in your headlight were designed for halogen headlight bulbs so those are best considering the engineering resources to optimize its use for halogen bulbs.
This thread on legality also echoes some of my thoughts on the unfortunately-common bulb changing modification: http://www.jeepforum.com/forum/f428/...legal-3600962/
IMO, if you will inevitably swap bulbs using the stock headlamp assemblies, don't waste your money on HID's and get LED's. The LED bulbs, based on limited pictures I've seen, seem to have better use of factory reflector housings than HID bulbs, which spew light everywhere and can actually worsen vision at night.
Another thing to add since you're asking about bulbs, Kelvin color temperature doesn't mean higher light output, it just means higher color rating. Color choice for human eyesight is probably best kept at around 3200K to 6000K, though I personally think 6000K is unnecessarily-blue for fashion reasons. Also, please don't be the fool who gets 8000K or higher color temperature bulbs thinking it is brighter, you will actually end up seeing less.