I have a cheap old Energizer that someone bought me for my birthday a long time ago. It still works, but won't stay in position anymore.
So last year I got a Black Diamond Storm. It's great - I bought it for its high lumens and also because it is waterproof, which most headlamps are not. I think I paid around $70 for mine, but Amazon had them for $23 as recently as last week. My one complaint is that it is too complex to use - it has something like 20 different modes, and they are all accessed by various combinations of push button/hold button/tap side X times.