I'm thinking of replacing my battery with an Optima "Yellow Top" Deep cycle battery. http://www.sounddomain.com/sku/OPTD750U I was wondering if anyone has or has had one and can tell me if it's worth buying. I am slowly going to build a very large sound system as money becomes avaliable (3 amp's, kappa perfect component all around, 2 kappa 120.3dvc sub woofers, line driver , equ. and crossover).