Here are my top three choices:
Check this out, I have one of these on my boat, wouldn't swap it for anything else: Xantrex Technology Inc. - Boats - XC Battery Chargers - 12V & 24V - Product Information
Charges three different chemistries at three different levels of charge at the same time, needs only 750 watts of input power to work. Read the spec, you'll like it.
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"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."
Arthur C. Clarke