The XTAR VC4 Battery Charger is our pick for overall best charger . It is inexpensive. It is easy to use, put batteries in and wait. It uses any 2amp USB power source, even a NekTeck solar panel can charge four batteries at a time. The charger can charge a wide variety of battery types including: 10440, 14500, 14650, 16340, 17670, 18350, 18500, 18650, 22650, 26650, 32650, AA & AAA rechargeable batteries. It can't refresh but for the price and features this is a BEST BUY. We use it for all our 18650's and 14500 batteries.
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Our overall favorite for AA/AAA only is a tie. Both the BC1000 and the C9000 are excellent. If you have more sensitive batteries go for the c9000, if you need a lot of AA & AAA batteries refreshed we prefer the BC1000.
If you want tons of info on it see candlepowerforum.