I have a Moonlight Pro. It is 3AA, but doesn't dim like the newer version of the regular Moonlight. It is a good light, and the most compact 3AA headlamp I've ever seen. If you want the dimming feature also, you could buy both, and swap heads. The regular Moonlight is on sale at rei.com for $20.
If you can get by with 4 5mm LEDs, and don't need more throw, I believe it's your best bet. Some other options are Black Diamond Gemini (incandescent with 2 LEDs), and Princeton Tec Yukon (narrow incandescent with 3 rather bluish LEDs). The Yukon is my current headlamp favorite. My Moonlight Pro currently resides in my glove compartment, where it makes a superb and compact emergency car repair headlamp. If you use AAs, and find that you like another headlamp more, you can always do that with it, and it is excellent for that purpose. So the way I look at it, you can't lose by buying one.