The Yukon HL is nice with its dual output, and esp with the AA battery setup, you get a very decent runtime. I'm more a sucker for smaller setups, so if you don't need a lot of throw from your headlamp and would like to save on space, look at something like the Petzl Tikka Plus or Zipka Plus. Gives long runtime for short distance illumination. I personally prefer the PT EOS, small size and decent illumination for short to medium distance. Runtime is quite good as well for 3AAAs.
Well, since you have a handheld light for spotting longer distances already anyway, the above mentioned should pretty much cover most of your other backpacking needs, I think...