I expect that the PI lights would work well. I don't have them, but any high power halogen should be an improvement over stock. Just be sure to add a relay kit so you don't burn out your headlight switch, or worse, cause an electrical fire.
http://www.panteraplace.com/Tech%20Info/Volts%20of%20Confidence.pdf
http://www.panteraplace.com/page116.htm
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