Silverstars are nice bulbs, but IMO I found something better for a lot cheaper....a 55/100W H4 bulb. I got it on ebay for $5 shipped from "All Catz Lights". Low beam is what you'd expect, but the highbeam is awesome. FAR brighter than stock, "throws" it a lot farther, and I noticed it "spreads" a lot better, lighting up the ditches and side of the road much better also. I got it for Adirondack roads at night to try and avoid critters. The caveat is that they are for "off road use only" since the highbeam is higher than DOT specs. I have yet to encounter a headlight wattage checkpoint though...
Ran it all summer (10k miles worth) and no issues, so quality seems to be good. Even running the highbeam on all day as always, I have had no issues with heat in the headlight or wiring up from the extra load.
Link
The price seems to have gone up a bit in the last couple months, but still $7 shipped....can't beat that.