Need help choosing a capacitor... brand,model,farads, etc...?

I have a kenwood excelon x1200m monoblock currently oushing a jl 12w7 in h.o. box at xactly 2.47ohms (about 1,000w Rms) with a yellow top optima battery under hood, Big 3 upgrade, and 80amp stock alternator. Have minimal dimming problems and my budget suxks so dual batt setup is out of the question as well as high output alt. Not looking for a miracle just a "little" help. Any info/LINKS would be greatly appreciated, Thanx sooo much in advance.