I had an HID dipped bulb (not sure how good a version it was, build was good but didn't seem as bright as I'd hoped).
I decided to take the plunge and go LED for dipped and main and have not regretted it. I have 3000lm leds with inbuilt fans, they are bulky and tricky to fit as I had to do a fair few mods to get them to fit, but they are fantastic on the road. The ability to have a powerful main beam that you can flash with is perfect.
I believe there are slimmer bodied versions now with some doing fitting kits for the Bird too.