You would think that Bush would have been affordable to us at $3.5M per year that CHI signed him for. That said, Im not sure Bush is good enough to really produce behind our OL, but I could be wrong.
With Bush, Tolbert and BJGE all signing elsewhere without much talk of Pittsburgh with any of them, I think it's safe to say that the Steelers are prepared to go into the season with the RBs currently on their roster, no?
Not necessarily. Can always draft one, or do what they normally do: Wait until the 11th hour and go after veterans who haven't signed yet(e.g. the Mewelde Moores of the world).

As usual 5-ish, you hit the nail on the head here.
Steelers were never going to make a big splash at RB in FA (the last time they did that was Duce Staley, and we all know how THAT turned out)
More than likely, Steelers will wait for the draft to add RB depth, dont be surprised the Steelers to use a relatively high pick (#2-4) to do so as well.
If they go the FA route, they will need the MM type back. I think it'll be Justin Forsett. Other possibilities: Ronnie Brown, Jerious Norwood and Chester Taylor
If I'm Kevin Colbert, an interesting name I wouldnt mind them adding would be someone named
Ladainian Tomlinson. You may have heard of him. A 3DRB who can catch out of the backfield and spot-start if something were to happen to Redman.