optima yellow top is what i would go with, i have a shuriken working as an extra for my subs and the yellow top under the hood
When I was selecting new batteries for my boat, to me the important requirements were maintenance-free (met by AGM batteries) and long run time under load (met by the Lifeline GPL-31XT battery w/ 25% more Ampere-hour rating than ALL the other group 31 options). My system has six of these Lifeline batteries, three powering the 2,500W sound system, two more that can be switched-in for extra run time and a sixth that is isolated w/ the only load of starting the generator that then powers the AC to DC battery charger.