I wouldn't touch anything that has the word cap in it. I've had caps and for the price, they are worth s**t. I had like, 800 watts bumpin' my first system with a cap and my lights dimmed like hell
I am running about 2000 watts now and have 2 yellow top Optimas, one up front and one in the trunk and have a 250 amp alternator.
It is RARE that I get dimming. If I do, its usually when I start the car up and start bumping full blast