I'd rather not drop the coin it would take to get TonyG, to be honest. That's going to be a $30m -- $40m contract, no matter how you slice it. I'd rather take that money and spread it out between another backup OG and a right tackle (Runyan, Tre Thomas, Flozell Adams).
Steinbach's going to cash in big in FA and I really don't see why he would want to come to Oakland and be part of a rebuilding process unless we overpaid for him (see Steve Hutchinson). Hutch's contract is seriously going to inflate Steinbach's value. That's not to say he isn't a damned good LG, because IMO he's top-5 in the NFL at that position. But he's young, still improving, and looking to get paid. Be prepared for a 6-yr. deal somewhere in the neighborhood of $45m. I would expect Dallas, Miami, Denver, New Orleans, and Detroit to all have serious interest in him. He'd be my #1 priority in FA this year.
Peterson? Sign me up!