AA would be any of the Princeton Tec, Black Diamond, Petzl detached (rear) battery pack headlamps (Apex, Icon,Myo XP) and single AA aluminum lamps would be from Zebralight and Spark.
Traditional AAA plastic headlamps would be BD Storm, Petzl XP2, and PT EOS.
The Storm and the EOS are waterproof. I don't know about the rest in that regard.
Beyond that I think you would need to be more specific as to what you're looking for...type of beam, brightness, spot and flood, red LED?