Dave,
Here's a link to one of the threads - Recommendation: Odyssey PC680 or PC925 for my build?

I used a XS Power D680 AGM battery, mounted under the dash on its side with the terminals coming out toward the seats. I've had zero problems to date - keep a battery tender on it much of the time it's parked. When I researched them I liked the XS Power units - seemed to have just a hair more "punch" than Odyssey, just my $0.02 on batteries. I'm not a fan of the spiral wound Oddyssey's - very inefficient use of space, and they can be a bit cantankerous if they discharge too far, but then that's just an AGM thing....