I had my eye on the Moon300, but would it be better than two smart Lunars? And thanks for all the suggestions, if the posting wasn't so long, I would probably go for one from
eBay
I've got a Moon 300. It's bright, the battery lasts more than two hours on high and it's quite enough own its own even in unlit lanes up to about 20-25 mph. The only drawback I've found is that the battery doesn't like the cold - charge it up fully and if the temperature's close to zero you get the low battery warning!
Another option is a pair of Ultrafire 501b torches from Deal Extreme (I suggest two for redundancy: Ultrafire aren't too hot on the reliability front). The XP-G version is slightly brighter than the Moon 300, and a decent 18650 lithium ion battery will last 2-3 hours (capacity dependent). You'll also need torch mounts, batteries and an 18650 battery charger for that, though.
DX also do a clone of the Magicshine light - but I'd recommend avoiding that and spending the extra money on the Magicshine instead - it's far better quality. You can get a Magicshine MJ838B with a Cree XP-G LED for less than £40 which is both brighter and has a longer burn time than the Moon.