For occasional use like that you want low self discharge NiMH. Sanyo Eneloop, Rayovac Hybrid, Maha Imedion, etc. I use those with all my gear, one set in the camera, gps, etc, the other ready to go.
Also remember a decent charger, most of the ones you find in box stores are crap, the powerex maha, or lacross are the best.
+1.
Sanyo Eneloops seem to be the best performers.
I also have a bunch of Duracell Pre-Charged Rechargeables and they seem excellent. HINT: if possible, buy the white-tops (made in Japan) as opposed to the black-tops (made in China). You'll get better performance.
I can't overstate the importance of a good charger. I'm having really good results from the Duracell Mobile Charger CEF23DX4N (got advice from CPF). Individual charging channels, 12VDC or 110VAC operation, and it won't cook your batteries. I was even able to bring a bunch of old Energizer 2500s back from the dead with this charger. You can find them on sale for under $20.