To the OP if you decide you must spend a vast amount of cash on a bike light, get some of the Four4th lights. Vastly brighter than the DX one and the MaxxD. And cheaper as well (and built in the UK etc etc). And smaller. And with a very clever bracket.
Having seen all of the popular expensive lights (and ridden in front / behind them), and compared beams etc, the only one that's actually tempted me to ditch the DX bike light and get a new one is the Four4th one. Better even than a Wilma 6 (or whatever that stupid lupine thing for 600 quid is called).