I'm all for upgrading the SP, but this team has so little budget room, if any, that it might be better off getting 3 players for the price of 1 SP.
In reality, I highly doubt they'll address the defensive issues. AA said this past off season that he wanted to upgrade the D and went on to sign Navarro and pick up guys like Francisco and Valencia during the season. It just doesn't seem to me like they appreciate the value of defense.