Looking to add a second batt to my system it unsure of which model to purchase. Currently looking at either the d3400 or the d2500 which is in xs's new xp line for 2012. Which is more important? Amp hours or max amps. D3400 has 3300 max amps with 67ah while the d2500 has 2500 max amps with 100ah. Price is not an issue as they are within 40$ of each other. On another note, I am going to be running a m3a at 1ohm. I currently have a red top up front and a 220a alt. Will this be adequate electrical with the added xs batt I listed? Or should I step it up to the big d3100?