Got an Autozone nearby? You could just get a Duralast Gold, 640 CCA. The regular Duralasts are only $15 cheaper, so the Gold is a no brainer. 3 year free replacement, one of the top rated batteries for years...Edit: I think even after the 3 years is up, they'll give you a pro-rated replacement for a time.
Just a thought.
Same with Advance Auto and their Autocraft Gold batteries. I had one die in another vehicle at about 30 months. Starting was becoming difficult even though I never ran the battery down or abused it. They tested it, saw that it was failing, brought out another and installed it on the spot for free. They have AGMs in some groups.