Allow me to make a suggestion: use a red top instead unless you're doing something that requires the deep-cycle capability of the yellow top (i.e., winching).
I've run both at different times, and have to say that unless you're putting severe and/or extended draw on your battery there's no advantage to the yellow top. In my case, we were running mainly radio gear at the campsite for long periods of time, so it made sense - but once that was no longer happening (and the yellow top finally croaked), just running a red top made a lot more sense.
In either case, I'd strongly recommend getting one with the highest CCA rating that will physically fit and upgrading both the mains and grounds to something beefier, especially if you're doing high-demand stuff - the stock wiring really leaves a lot to be desired in that regard.