That Interstate 27 would likely have 800 ccas. You should be at least around 1000 with all of those accessories, so many group 31s will work. If your graphs are wired through the boats harness, then wire them directly to the crank battery with 10 gauge marine wire, fuse them close to the battery, and be sure to run both negative and positive wires to the battery. Or, get the harness and block from the BCB store as suggested. If you dont already have one, some type of battery disconnect for your Talons will prevent parasitic draw and prevent accidental deployment when trailering.
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