"I'm torn between Deal Extreme and something bike specific with a UK warranty etc."
Dealextreme have actually proved pretty good with warranty claims. Not fast as you need to post back to HK, but then not actually any slower than some UK warranties. I'm very happy with my torches, but if you want a "proper" light then these are a fine choice.
CountZero: "Sure, it's not quite as whizzy looking as a Joystick, "
It is on the other hand massively, massively better I loaned one of mine to a mate tonight and rode on with just one P7 torch, turns out that one P7 gives better results than a Joystick + a pair of Minewts.
Grahamt wrote, "Ayups are great lights "
They're really nice... But sadly underpowered, and they've just not kept up. Their aftersales service is fantastic but tbh, selling an outdated product for top dollar isn't good customer service. They need to up their output, simple as that.