Is it an NL-only league?
If it isn't-- I don't know why Chavez doesn't get any love from people anymore. He's a tremendous second half player, historically, and I think he'll do _at least_ as well as Lowell from here on out, hence, Lowell's numbers will look better end of the season, but Chavez may outperform him from this point forward. Similar to Rolen. End numbeers won't look as good, second half numbers (I think) will look better for Chavez.
I'm actually a little disappointed to have to say that-- as I predicted Rolen to be the NL MVP this year (wrong! Pujols anyone?); and Rolen hasn't been as good as I expected in a Cards uniform.
If you were thinking of moving Lowell, Chavez would be my target. I am not thinking of moving Lowell, I have Aramis Ramirez-- and Chavez is _still_ mytarget!