The thing about getting the higher CCA battery is that it will usually be the one with the highest reserve capacity which can make a difference if you run any accessories without the engine running.
I have a 720 cold cranking Amps (900 cranking Amps) Duralast gold from autozone. Biggest battery i could fit in my Jimmy's battery tray and has been in there since 2006, think i may be on my last year .
Stock AC Delco Battery was used depending on which option packages you have, the two batteries used were, I believe, 550CCA and 650CCA.
Go with the highest Cold Cranking Amps (CCA) that you can fit in your battery try, and i think that would be a 925 CCA. Good luck.