Capacitor questions

Hey,

I've got a few questions regarding capacitors.  I am purchasing a Rockford Fosgate Punch 601S, which is 300W RMS per channel, to power my two 12" Infinity references.  I've got a 4 channel amp powering my speakers in my car (4" in dash, 6x9 in back).  I know that when I get my subs in my car, it's going to affect my performance.  I've got 4ga power cable runnin to the back, which I'm going to put into a power distribution block when I install both my amps.  My 4 channel amp is a 4ga right now, and I believe the RF amp will be 8ga.  How do I work that?  Also, does anybody know how to wire two amps at once to one turn on lead?  Am I going to have to use a relay?

As for the capacitor question, should I go with a 1F capacitor?  Anybody have recommended brand names, or do they all pretty much do the same thing?  I'd like something relatively cheap(i'll get it on ebay, i'm on a limited budget).  I am also going to install it myself.  Anybody know of a website that tells you how to do that step by step?  I'll go check crutchfield in a minute, they usually have an OK learning center for that type of stuff.

Well, I think that pretty much wraps it up.  Thanks a million guys.

--mindctrl