I've tried most of the stuff everyone has mentioned.

Trust me - the MagicShine at about $100 will beat the pants off everything mentioned in brightness, price, bang for buck, runtime.

The closest thing at REI or your LBS will cost over $400. It really is that good.

200 lumens is dicey enough for me to not feel comfortable at all on roads riding a road bike. I can do it, but I'd only do it as a to-see light in emergency situations, since over 15mph, you can't see much at all.

Riding with MS at night is awesome. The tail-light is also awesome, and can run off the same battery pack without much drain on the headlight. (It is as bright as a $120 Dinotte tail-light.)

You really are wasting your money with anything else, it's that good. (It's amazing how advertising bike-specific stuff in magazines and stores can still cause folks to buy puny 100 lumen lights for $100+ when the MS is around.)