I think Blalock is still underrated after his performanace last year. He is no fluke according to several respectable sources, and the Texas park can't hurt
Agreed, most casual fantasy players will rate guys like Lowell and Glaus over Blalock, but in my opinion, he has a chance to be every bit as good as Rolen and Chavez.
To that end, I think he's still pretty drastically underrated.
In fact, aside from SBs I'd be surprised if there was a significant difference between the production of Chavez and Blalock, Blalock may even end up with better numbers (Neither can hit lefties though).
Ensberg is underrated by the casual fan, but overrated by many around these parts. I'd wait to see if Ensberg started hot, unless you can find someone who thinks he's already a top 6 3B (some here in the Cafe). I'd keep Blalock for sure.