with that power you would be good with a walmart battery and the big 3 upgrade.
Hey Frito, I already have the big 3 ran in the car.
At one point the cars stock alt. was sticking at over 16V intermittently (sticky volt. regulator), which I'm sure really hurt the stock bat, so I upgraded to a 220 in the car. I'm very interested in getting a deep cycle or spiral cell batt, because I do intent to upgrade to another 12 sooner than later. I hate buying Walmart / K-mart / any marts electrical brands, I'm look at getting something with some steady power and a trusted name. I'm hating the dimming!!!
If your only running 600 watts, you shouldnt have dimming, I wont say walmart this time, but you would be fine with say a duralast gold battery under the hood, or you could get an optima if you felt necessary.
You asked for best for your buck, and in your case you dont need and expensive battery.