Need different battery?

[suckerface]

This is a cross post from MI, but hoping to get some solid input here too...

I'm looking to replace my stock battery with something lightweight (i.e. Braille), but I don't want to shoot myself in the foot. I've just recently acquired an amp and 2 10" subs (see specs below) and don't want to overdraw the battery. I'm currently looking at the Braille B129 or the B14115. Will these do the trick for me without issue, or would it be advised to look into a good quality capacitor to help compensate?

A Kenwood eXcelon KAC-X201T (see details here):
http://www.crutchfield.com/S-xQg93F7...ms#details-tab

And two Jensen XS 10" subwoofers (details below):
http://www.electronicsbonanza.com/co...idProduct=5374

I'd like to upgrade my interior speakers at some point (hopefully this summer) and am looking at a set of component speakers from Infinity (I think...it's been a while...)

So, capacitor, yes/no? Thoughts on battery specs? I hope to get the amp and subs set up in the next month or so, so I have some time to figure things out.