I may try the Sylvania Xtravision H13 lights. They are cheap, and claim 35% more light. They get decent if not glowing reviews. Bulb longeivity is an issue with the silverstars and ultra, I don't want to change them every 6 months.
Here is a great vid that shows a step by step on how to get to the hack of the headlamp box to change the bulb (or replace the whole thing). Remeber, never touch the new bulbs with your nakes hands, the oil from your skin can decrease the life of the bulb. Wear clean gloves.