Catz has a very nice, high-quality 9006 upgrade kit.

I tried it on my '03 Accord, and the light is brighter, cut-off quality is maintained, but the stock reflector design produces hot-spots on the roadway. The hot-spots actually resulted in a _decrease_ in perceived brightness from the driver's seat. I ended up backing the kit out, and going back to stock, halogen 9006 for the time being. At this time, it's a $500 experiment that's back in its box until a high-quality projector kit comes available for the car.