I ordered the HID conversion kit from
XenonRider.com - Xenon Rider Automotive Xenon & Bi-Xenon HID (High Intensity Discharge) Headlight Conversion Kits for Cars & Motorcycles and There is no comparison to any "regular" bulb that i have found. fairly easy to install (took about 1.5 hours start to finish) and the single bulb hi/low H4 kit was about $140 shipped.