Our DC needs to be fired, #1.
Then... we need to find somebody like LB Clay Matthews or LB Vonn Miller in the draft. If we identify one, I would even trade up to get him (like the Jets did to get Sanchez and Revis once upon a time).
Then draft for depth across the board. Sure more OL would be great, but if we were not riddled with injuries along the O-Line, I don't think we would be putting this as a priority. Sure CB would be great, but I truly think that Aaron Williams will be MUCH BETTER next year, so I would hold off on making too big of a splash to get another corner.
Our weakness on offense is injuries... Injured Center and Left Tackles, and injuries to Freddie and any WR opposite from Stevie.
Our weakness on defense is lack of pass rush... that could be erased by drafting an elite talent and hoping that Merriman can stay a little healthy and become a situational pass rush guy for us, since he still will be under contract. A healthy Kyle Williams would hlelp our defense immensely.