I think steals from the 2B or SS position is a great plus for a 5x5 league. Most OFers can give you power production similar to what a top notch or above the average 2B/SS can produce. Getting a guy at 2B or SS for steals like Castillo, Jeter, Vizquel, Rollins, etc. can do wonders for a team in a 5x5 league.
Having that said I think you want to stay away from Alomar this year. This looks like one of his off years. He had a couple of these thru out his career where things just dont get out of the slump. Try send someone else for Castillo or Durham.