I put a xenon 100 watt bulb in my XLT. As racerdave indicates, the design / reflection of the 'ol wedge headlight assembly is the problem, not necessarly the bulb itself. That said, the bulb is slightly brighter, and at about $15 for the bulb, it's probably worth it.
Besides, you can get 'em with tinted colors and everyone knows that looking good is the real object of snowmobiling.
Xenon purple tint