Good morning all, looking for some opinions and recommendations for a Battery. I have a nice little 1979 San Juan 7.7 that i purchase last summer. I need a new battery and i think i would be fine with one deep cycle, I am thinking a group 27 deep cycle. The only motor i have to start is a 2009 Yamaha 9.9. Seems like the normal Interstate batteries are a pretty good deal, about $115 for the group 27, anyone have any input?