Just got my Philips Saferide LBL in the mail from Amazon today for $100. Slapped it on the bike and took it for a test ride and I was nothing but impressed. That thing puts out a ton of light evenly, doesn't wreck your nightvision, and is visible to others but doesn't blind them. Can't really ask for more than that.

When I finished my test ride I went to turn the light off and figured out that I'd been on low power the entire time. The high setting is a lot brighter and I'll check that out when I go into work in an hour or so.

Probably a little pricier than you're aiming for but I'd definitely consider it.