Gonzalez would be Zat Knight v2. Good in the air and at clearances, but just doesn't have the pace and possibly worse on the ball than Baker.
I'd be looking at Deandre Yedlin. 20, super raw, but has pace to burn, some trickery and is very aggressive, can cover the wing or right back, though probably not ready to defend in this league. He is remarkably good at getting in behind defenses and cutting it back.
Alejandro Bedoya *might* be able to make the step up, as well. He's been steadily improving year after year, would be roughly comparable to Hoolahan, imo, but younger and with more physical presence.
Johansson (after a bit of bulking up) would probably be decent option up front if we were to play to his strengths, but I don't think we would (or even could, at the moment, as we don't have anybody to play through balls or proper wide men).