We don't need that much more on offense, QB aside of course.
We need a decent TE, and one will almost certainly be available in FA. Julius Thomas? Come on. The guy wants to be the highest paid TE in the league. Why in the world would he want to come to a place that doesn't have an established QB? It would take far too much to bring him in, and it wouldn't be worth the money. Someone like Cameron or even Clay (per Buff News) would be more affordable and provide the play needed at the position.
Other than that, we need another G, but from all that has been said by Rex and Doug, they're looking to bring another one in. We don't need to spend crazy money on a Iupati to get what we need at the position and still make the OL a strength.
So...what else? Another RB? No way, not in FA. Not with the current stable we have. A draft pick will fill the need here.