Well, if you draft a great third RB like that, you know that he's trade bait. Do you play ib a league with actively trading owners? That would go a big way in making my decision.
I agree with massraider...you can't go wrong with three top RB's...you have trade bait or depth. However if your turn comes up and Harrison, Moss, Owens are there...grab one. Also I disagree with Cornbread..Alexander is not inconsistant. He got off to a slow start last year. A lot had to do with half of the o-line either being hurt or hurt by hold outs early. This could be a big year for him.