Well i currently have a kinetik KR912. supposedly rated at 35ah. Got it for $50 local practically new so figure can't be bad to pick up.
Right now im torn between the BT-45 and BT-60.
I will be running a kicker kx 850.2 @ 2ohms each channel to 2 sundown sa-8v1.5s along with a kicker zx350.4 to the front stage. so i think 45+35ah + 220a HO alt + 0ga big 3 and upgrade wiring all around with full 0ga wiring to the back should be more than sufficient.