CatEye Tripleshot is a nice option. Futher, I personally like the systems from Hope, Light&Motion and Lupine (all three have LED and HID systems). They are crazy expensive though, the Cateye costing $250-300, Hope is in the same ballpark. L&M and Lupine make lights up too $800. On MTBR.com they've got a lights/elec section, you can find al lot of info there. I'm currently making an DIY system with square alu tubing (yes, copycat design), 3 XR-E's and a bFlex driver. Should be a very nice system that blows the best LED factory systems (Lupine Wilma/Cateye tripleshot) completely off the map, since they've still got ancient Luxeon technology. All parts included the price should be around $130 (mostly depending on the accupack setup, can range from a simple little Nihm pack too a high-capacity Li-ion), but I had most of the stuff laying around, only needed the LED/lenses and driver.