After working the parts counter for a few years one of the best bangs for the buck would be a duralast or duralast gold battery from AutoZone. Their actually made by Johnson controls ( known for optima batteries) their really reliable and they dont look to bad under the hood. I was thinking about going with a yellow top optima because I plan on putting together a system soon for my ap1, but I'm not sure if it's worth it. Not to mention I have had to warranty a few of them with in the past year that went bad before their time.