Well, I can give you some advice on caps... The ones that claim to be 30 and 50 farads, are false. They are not really that much. If you put into perspective how much 1 farad really is, where most electronic appplication that use farads are measured in microfarads, 50 farads for a pop bottle sized piece of metal is quite unrealistic. 1 farad will do you fine, depending on the amount of power you are producing. I only have experience with my 1 farad Fusion Cap, and I can't complain, it gets the job done well. However, I've heard good things about Stinger aswell, both of which are easy to get your hands on around here.

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Alpine 9856 Deck .
Clarion EQ.
Fusion 6.5" Door Components.
Fusion PowerPlant 4 Channel.
Blaupunkt 6x9's.
Powerbass 2400D running at 0.5 ohms.
4 MAW-15s in an 8.5cu/ft box @ 32hz wired to half ohm.
2 Fusion 1 Farad Capacitors.
4 runs 4AWG powers and grounds.