Battery options BESIDES Optima?

FWIW I plan on using a sealed battery hidden in the passenger compartment and plan to use a couple of small sealed agm dyna-batt style "hot rod" batteries. These are essentially motorcycle batteries, but I want a slim profile. I found an interesting (possibley over-detailed) page about it by a guy customizing his dodge stealth:

http://www.stealth316.com/2-dynabatt.htm

http://www.stealth316.com/2-battery-move.htm