You might want to give us an idea of your intended use(s) for better suggestions. A good work headlamp may be quite different than a good hiking/camping headlamp which is yet again different from a good cycling headlamp...
The HL21 is hard to beat at that price point regardless of the activities.
3 modes with memory (low, mid, high).
1 hidden SOS mode (double click to access).
Comes with a built-in diffuser for close up applications.
XP-E LED with smooth reflector provides excellent throw.
Only needs 1 AA, easy to buy and easy to scavenge.
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3, 45 and 90 lumens. The mid mode gets a solid 5+ hours of runtime and is bright enough for pretty much any task. The low mode is useful for reading at night. High mode isn't really necessary as the medium mode is as bright as it is. Fenix really should've given this light mode spacings like this - 1, 15, 50 lumens. It's still a good headlamp as is though.