On my 98 RMX (moron previous owner threw the stock light away) I put on one of those 1 million candle power handheld 12v spotlights I got a walmart for $10. You have to space the bulb back about .080" or so to get the beam wider, but it was brighter than other stock bike lights. To mount it, I cut the handle off, cut a bit of the back of the light body to clear the steering head, and bolted it in upside down in the stock numberplate (see pic). You also need a screen over the glass lens.
Also note my radiator fan (actually a high-po computer fan) but that is a story for another thread.