There are many, many headlamps in all combinations of size, brightness, runtime, modes of operation, etc. You can check out a variety at any camping store. A couple good online resources are

http://www.flashlightreviews.com/ (No longer maintained but still reasonably up-to-date)

http://candlepowerforums.com/

Both have sections dedicated to headlamps.

I like my Princeton Tec Aurora for its small size, light weight, and wide beam. Downsides to it are: non-regulated electronics so it gets dimmer gradually instead of maintaining relatively constant brightness, center of beam is slightly bluish-tinted, and it casts a bit of glare down on my face (mostly fixed with electrical tape across the bottom). I also like my wife's Princeton Tec EOS for its bright concentrated beam. Both have been around a while so there may be better newer alternatives.

Steve
_________________________
"After I had solaced my mind with the comfortable part of my condition, I
began to look round me, to see what kind of place I was in, and what was
next to be done"