Renteria and Eckstein have both been putting up good numbers, but lately, Renteria has had the edge. Eckstein doesn't drive in enough runs, unfortunately - play Edgar, unless you really like Eckstein's matchup.
I think Huff is for real. I was expecting decent numbers from him last year, but was apparently a year too early with my expectations. He may cool off just a little, but he's solid enough that he's worth a shot over Lowell.
I'm also stuck with Pierre, Sanchez and Dunn on my primary team, and have the same problem. I probably shouldn't try to give any advice here, since I've managed to miss far too many stolen bases by using a platoon system, but for what it's worth, I'm going with Sanchez/Dunn right now, at least until I see Pierre's name in the starting lineup again.