while I appreciate the suggestion, that doesn't really help me. What size yellow tops? Why yellow tops? why not a Kinetik? Why not an Odyssey? All three claim to basically have the same technology, high discharge starting with deep cycle capabilities.

I guess what I'm trying to get at is why is one option more expensive than another and is it worth it?
Is the kenetik the same as a yellow top, but in a smaller package? Or is the Odyssey and bigger, heavier battery that can handle running a system with the car off for longer than other batteries?
I don't plan on having the system banging with the car off for more than a few minutes at a time, 20 min max and that's only going to be at shows and what not. It almost seems like all of these batteries are overkill, assuming there is enough power coming from the alternator to keep everything charged.
Still trying to sort through the mis-information on the net and all of the misleading marketing hype to determine the true needs.