Are you familiar with Sanyo Eneloop rechargeable batteries? They are most-noted for their low self-discharge rate. They work great - They are what I use in everything from camera flashes to tooth brushes.
The Sanyo Eneloop Power Pack Battery Charging Kit at B&H
is currently a good deal.
The Sanyo Eneloop Power Pack Battery Charging Kit includes 8-AA batteries, 2-AAA batteries, 4 "C" Spacers, 4 "D" Spacers and a compact 4-battery slow charger. Read about the rest of the features at B&H