I'm tight and cheap. I'd buy a cheap one. Just don't fall for the Xenon bulb tricks... Automotive stores are abound with 'fake' Xenon bulbs. They're not fake, in that they have Xenon gas in them, but they have a filament. A PROPER Xenon HID headlight has a Xenon filled bulb but no filament, it requires a ballast to run. So, if the Xenon kit does't have a ballast with it, it's not proper HID. The kits I've seen are for cars, so if you've got two motorbikes you can HID them both, or sell it off on here

Nobody has mentioned the word HID, so I thought I'd better share the knowledge.