There's the reconyx and then everyting else. That's what I came to after trying 4 different ones.

Buy from a place you can return and try them out. I did and although it cost me to do it, I built up points and they rewarded me for spending 0.00 dollars after it was all said and done.

Been using the reconyx since last spring, 10,000+ pics, no measurable loss of battery life. Zero, zip, nada battery drain. Just amazing.