Get HIRs. Silverstars are a fairly mild improvement for a steep price increase over standard halogens. I ran Silverstar Ultras for a year or two, and then went to HIR. The difference was amazing, the HIRs were much, much brighter.
As for those LEDs, don't even bother considering LED replacements for headlight bulbs, not only would the focal point of the light be completely wrong, causing light to go everywhere, making for unsafe conditions for oncoming drivers while reducing the effectiveness of your headlights, but also, those lights have less than half the luminous output of a standard stock bulb (it'd almost be like using those free flashlights from harbor freight instead of headlights!)