Because I thought I could
Join Date: Dec 2004
Location: Wash DC Metro
Bikes: November, Trek OCLV, Bianchi Castro Valley commuter
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Don't forget a rear light, at least a blinky but better would be a Planet Bike Superflash or the Dinotte tail light (watch for sales, esp. if you have or can get a battery charger on your own). I have a Dinotte 200L headlamp, which works very well for my commute. I am on partly-lit suburban streets and trail so it's more of a be-seen light. Although during the darker winter months, it has come in quite handy spotting pedestrians and bike ninjas (local day laborers without any lights). I've seen another rider on my route with a Dinotte 140L taillight, a 200L headlamp, and a 600L ($$) on his helmet. The 600L is an LED cannon and really lights up things. A 200L might be good enough; I'd recommend at least something like a Cateye Opticube EL410 on your helmet as a backup and a spare set of batteries (I carry AA lithiums for their shelf life), too.
As an out-of-box idea, many in the radonneuer community use bike generators - either bottle units that rely on friction with the tire, or hub generators. Plenty of light and no worries about batteries.
For GPS, can't recommend specific models. I'd look at units designed for handheld use (they can bet mounted on handlebars or kept in a jersey pocket until needed). An automotive unit assumes you have plenty of 12V DC power.