Most of the Maha brand chargers would work well. They have them priced all the way from the economical minded to the extravagant. Even their lower priced chargers work EXTREMELY well and are HIGHLY RECOMMENDED over almost any of the other brands out there. They charge just as well as the high end models, but just lack some of the more extravagant options and displays.
I have ALL of the chargers listed below and they all work VERY well.
If your really just interested in charging I would recommend the middle of the road MH401FS. This is my favorite 'simple' charger.
If your into analyzing your batteries in addition to charging them, etc. then either of the high end models (MH-C9000 or the BC900) are great.
Recommended models;
Lower priced
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Maha MH-204F - $23
Maha MH-C204W - $28
Middle of the Road
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Maha MH401FS - $40
Ferrari's of the Charger World
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Maha MH-C9000 - $58
LaCrosse BC-900 - $55
Go take a look at them here;
http://www.thomas-distributing.com/index.htm
Hope this helps.
p.s. Generally speaking STAY AWAY from any chargers that are so-called 'fast' chargers. While they may charge the batteries, they also tend to do shorten the number of cycles you will get out of your batteries in the long run.