My uncle had an optima red top and it wasnt all that its cracked up to be. I was tempted to get a yellow top as that was billed as their deep cycle battery, but advance auto wanted 300 bucks.
I know hte gen 1 guys go with the small UPS sla batteries, however I tend to use several accessories at once where most of them drive like a hermit.
The past few months in this cold weather I typically turn on both defrosters before i park and plug in my timer to my block heater. Next morning I go in, crank her up and walk back inside as the defrosters clean the windows and side mirrors for me. I then unplug the block heater, hop in, put on seat belt and go.
In the summer I used the ac at various blower ranges, so I just wouldnt fee comfortable with anything less than what came in it, thinking 24 or 26 amps reserve.
The group 51 battery I had was a starter battery and it basically lasted a month longer than its warranty. Lets see how hte deep cycle goes.