Well, prior to this year that player was basically Izzy, and really he probably is due to bounce back towards those numbers. Let's face it, we'd be listing him as a target if we didn't have him this year. If Goins can put up an 80 wRC+ his defense probably makes him close to 2 WAR. I'm not sure there's a need to bring in someone else unless they are a clear upgrade over Izzy (prior to this year), with Goins as the sort of wildcard.
We have to use whatever resources we have in the most efficient way possible. If that means we improve the team more by addressing pitching and catcher, and not not having enough left to bring in an obvious upgrade at 2nd, so be it. If it does mean addressing 2nd, then that's preferable.