Overkill Gauge, or Not?

Hey, I am putting a system ino my 1994 Oldsmobile Cutlas Supreme Convertible. I am using  Clarion DXZ935 head unit, a 760 watt Pioneer GM-X862 amp pushing two Pioneer Premier 12in TS-W126C subs, and two 200 watt Pioneer GM-X262 amps pushing a pair of front Pioneer 3 way 4" and a pair of rear Pioneer 3 way 6 1/2". The subs are in a 1.653 cu ft box each located in the trunk, and the front speakers in the top of the front dash, and the rears on the sides of the rear passenger seats(convertible). 

Here is where my question occurs. I will have capacitor and a distribution block on the side of the box, in the trunk. The sub amp is sitting on top of the box, and the rear speaker amp not too far away, but the front amp will be located towards the front of the car, if not under the front passenger seat. I am planning to run a 2 gauge positive lead from the battery, through the cap, into the distribution block.  Then 4 gauge to all my amps.

Is this overkill? Im not too sure, but i based my info off of the the12volt.com  website's wiring guide.

Also, does anyone have a suggestion for what farrad rating capacitor i should use(and what the heck is a farrad?)?

Any help would not only be not only greatly appreciated, but wiuld steer my in the right direction, for this is my first semi serious sound system.

Tank you for your time,  Accoustic1985

Best thing to do with the amps, build you a rack/board to mount them to. You mount them to the enclosure, and as bullman has stated will cause you problems.

Electronics don't like to take a beating.

Bass frequencies below 80Hz are non-directional for most people.  Some folks can determine direction as low as 40Hz.  I recomend not mounting your amp on the subwoofer enclosure simply because it will subject it to more vibration than if you mount it elsewhere.  The chances that you will damage your amp can be higher if it's mounted directly on the enclosure.

That being said, a lot of people do this with no problems, so whatever works.  I prefer to be safe rather than sorry.

As to the original question about wire gage, the answers above are correct that as long as the wire is sufficient for the current flow using larger wire only costs more.