San Francisco seems the most logical choice, however I would not count out a team like grren bay or the Jets from trying to make a splash with him. Prior to the draft I figured Dallas would make a play for him, but they drafted 2 rb's so I doubt that now. I do believe he and Ronnie Brown in miami would make for a potent tandem.
The Cincinnati Bengals seem to be making the biggest push for him. I think it is a good fit for them as Rudi Johnson is inconsistant and may have some problems with his hamstrings. And he can be a good veteran leader for 1-2 years for the likes of Chris Perry and Kenny Irons.
The Bengals aren't making a push... he contacted them and so they agreed for him to come in for a visit. They didn't draft a RB in the draft as most Bengals fan had thought. They were apparently happy with Rudi, Perry, and Watson. And if all 3 are healthy, it is a fine corps of RB's.
It wouldnt surprise me if he ends up in Chicago. Benson hasnt proved he can carry the load. New England is a dark horse that could use Alexander to help revive their run game.
Although I haven't heard anything about it, Chicago seems like a good spot. Benson will probably be gone soon so they need someone to share the load with their draft pick