I used http://www.1offmotorsports.com/
6000K 55 watt kit to change out just the high beam. Finding a spot to mount the ballast was the hardest part. Takes about 15 seconds for the light to warm all the way up. 1offmotor sells the canceller with the light so you don't get a bulb error. They responded to questions quickly. Rode some country roads where they weren't any street lights this past weekend and was really glad to have the extra light. Its about $89 and has the slim ballast which you'll want. I think 6000K is good. Gives a good white light.