The only bad thing about a capacitor is that if you look at how big a farad actually is you will see that it is equal to about 1/1000 of the size of a battery. they do discharge quickly, but the amount of charge that they hold is VERy small.
i have seen 25 farad caps and i think i might have to get one of those when i can afford it.

so far i have heard yes there are plenty of High output alternators for our application! but only found one brand, mean green, and then later found that it might not be the best quality (let me stress the word MIGHT).

what other brands are out there that woudl pump out over 140amps?

ive got a few friends with decent systems running off the "stock" alternator (unchanged since they bought it) in their jeeps with no problems. BUT i have had two alternators go out on two different cars because of my systems and not having a good enough alternator to begin with.. so im just trying to play it safe.

thanks guys