HOW TO IMPROVE THIS TEAM??

standard 5x5 roto league...very deep 13 team league
i know i need to upgrade at catcher...took him last in the draft
currently near the top of my league..but always looking to improve..would like to trade a starter for another solid stick

C Yadier Molina (StL - C)
1B Paul Konerko (CWS - 1B)
2B Dan Uggla (Atl - 2B)
3B Casey Blake (LAD - 3B)
SS Derek Jeter (NYY - SS)
IF Ryan Theriot (StL - 2B,SS)
OF Ichiro Suzuki (Sea - OF)
OF Denard Span (Min - OF)
OF Jason Heyward (Atl - OF)
OF Ryan Braun (Mil - OF)
Util Marlon Byrd (ChC - OF)
Util Travis Hafner (Cle - Util)
BN Michael Bourne (Hou - OF)
SP Matt Cain (SF - SP)
SP Tommy Hanson (Atl - SP)
RP Jonathan Papelbon (Bos - RP)
RP Jordan Walden (LAA - RP)
P Mitchell Boggs (StL - RP)
P Cole Hamels (Phi - SP)
P Darren Oliver (Tex - RP)
P --empty--
BN Ty Wigginton (Col - 1B,2B,3B)
DL Ryan Zimmerman (Was - 3B) DL
BN Justin Masterson (Cle - SP,RP)
BN John Danks (CWS - SP)
BN Chris Narveson (Mil - SP,RP)
BN Max Scherzer (Det - SP)
BN Ted Lilly (LAD - SP)
DL Hong-Chih Kuo (LAD - RP) DL

with this news of zimmerman potentially being "out for a while" , looks like u can use a 3B... maybe see what you can get for danks... possibly chipper?