I found that the OEM headlights didn't have enough penetration and tried a few bulb replacements. I concluded that that the bulbs were not so much to blame as much as the reflector or lamp assembly cased the light to disperse in a too wide of a pattern.
I bought a set of DELTA QUAD LIGHTS that replaces the OEM with a more focussed light.

The left light is Delta and the Right is OEM

 

It looks like the Delta is larger in diameter but it isn't. The light is a complete unit that doesn't use the OEM chrome ring to hold it place - it is already attached.
If you can change a headlight, you will be able to change to this .

 

Comes with a patch to convert to H4 bulbs. This is good because H4 is a readily available bulb and other (read higher wattage/ or clear bulb) replacements down the road. The other advantage is with the extension piece it allows more room to work (OEM is barely long enough to get your hands to the bulb).

 

which one did you use?

http://www.4wd.com/productdetails.as...0&partID=15592

or these?

http://www.4wd.com/productdetails.as...0&partID=15593

 

Will headlight gaurds (like the Rugged Ridge) still fit with these? or would they not look right due to the curvature?

 

I would go with the Xenon bulb since its color temperature is probably closer to natural light, and brighter than the halogen bulb. The halogen one is cheaper but just like the regular one installed already.