as a matter of fact, the manufacturer recommends the KHC1400 model battery for your type of install (Kinetik High Current Power Cells)... they also sell the chargers for their own batteries... the 600 model outputs about 600 Watts and the 1400 model supports 1400 Watts of power - i think their claim of 800 Amps is "burst", not "sustained"... at 1400 Watts, you are still looking at over 100 Amps, so, the battery is really powerful...

it might be worth it looking into this setup, in addition to the car's standard battery, that you should NOT be replacing.