I have Tightwads HID kit in my 6th gen. The light pattern is good, visibility is incredible and HID bulbs last forever... oh and only 35watts!
If you really want to stick with Halogen bulbs, look into the PIAA replacements ($$$$). I ran them in all of my ATV's, they put out more light at the same wattage and I can't say that I ever remember having to replace one, even with all the jarring around they took in the off road environment.