My vote is to stay with halogen but use Philips extreme vision or Osram nightbreaker. Maybe upgrade the stock wiring with a relay to make sure your light bulbs get all the power they can.
I've tried HID, blinds oncoming traffic waaaayy to much.
I've tried different LEDs, and they have a good light pattern, but they "look" like they put out more light, but in fact they do not, and it is 6000k wich is way to blue-ish and strains the eyes to much if you drive all night with it.
I do have heard lots of good things from the PIAA H4 leds from the Defender boys, but they are pricy, thats why I havent tried them yet.