Rechargeables use to be really nice, but now that they have rather bright LED flashlights and Lithium AAA batteries that will last for years and run the flashlight for many hours, I think they're a better option.

LED Flashlights and standard flashlights for Sale at CoolFlashlights.com

P.S. I've never used the vendor in that link and cannot vouch for them... I just used it because it shows the range of LED flashlights you can get nowadays.

If you want a really nice flashlight, do a search on "Inova." I've got one of their small ones for motorcycle camping and they are really nice -- but expensive.