If he tests the market he's a 25-30 million dollar prospect. Bak will be crazy to sign for less about 25. I bet he's asking for 26.
With the cap going down and QB salaries going up, I find it difficult to believe a team will spend 25-30 million on a left tackle - no matter how great he is. If you have a QB earning 30 million and a LT earning 25 million, there is 120 million left for 51 players. FWIW.