There are a number of great headlamps on the market, my first question would be what batteries you prefer. These are my favorites by battery type.

AA: ThruNite TH20 This is my favorite headlight of any battery type for patient care.

AAA: Princeton Tec Remix

CR123: Princeton Tec Remix-Pro

All three of these headlamps are small, light and durable. I prefer the ThruNite because it takes AA or 14500 rechargeable, has good range of light from super low to bright enough for trail running (especially with 14500 batteries). This is the light that I carry in my briefcase and at work for medical calls.

The Remix lights are both great options, especially if you want an alternative color light to preserve night vision. I have a couple of these with green secondary LEDs for various applications.