I've got (and like) a Petzl Tikka Plus 2.
It's not so bright that it burns out the retinas of people around you, but plenty good for wandering about or working on the bike. It has white light at bright, not so bright and flashing and a red led for when you don't want to wake yourself up too much or disturb other people.
20 odd quid I think. I've had Petzls for many years now and when the headband on one lost it's elasticity, Petzl sent one out to me FOC.
I also have a new cree, turbo-mega-bastrd, 50,000,000 lumen headtorch that to be honest it way to bright to be of any use.