Way too late, but I definitely recommend the CTEK battery chargers. Really nice high quality ones, great for leaving connected for long periods... and they're switch-mode, so light, cool-running, etc.

They make 12v and 6v variants too, but might take some tracking down in the US... here's the UK place I got mine from, lots of boat places carry them.

http://www.vertar.com/ctek/

Hugo