Which pitcher or pitchers should I pick up?

[SweetnessandForte™]

I'm in a 6 team, Head to head league.
This is my current pitching:
SP: Ryan Dempster
SP: Carlos Zambrano
RP: Brad Lidge
RP: George Sherrill
P: Jake Peavy
P: Ted Lilly
P: Justin Duchscherer
BN: Kerry Wood
BN: John Maine
DL: Takashi Saito

Here's the pitchers I can pick up:
Ervin Santana
Tim Hudson
Joe Saunders
Mike Mussina
Ricky Nolasco
Kyle Loshe
AJ Burnett
Andy Pettitte
Jon Lester
Manny Parra

 

[Killzone™]

I would either pick up Lohse or Parra.

Both of them have been incredible this season, so I'd narrow it down between then.

 

[PENSRULE]

Santana and maybe Saunders

 

[JayM]

ervin santana becuase the angles are the best team in baseball right now and he gets run support from there hitters or mike mussina becuase he is the best pitcher on the yankess right now he has 12 wins one right behind there winiing leader and he is doing incredible this year

 

[roadkillm]

who are you planning on dropping? and why did you boot me from co-mgr?

Andy Pettitte has pitched better than any of them over the last month

 

[koskiefan47]

I would pick up ervin santana. He is a good pitcher on a good team. He gets good run support and can pitch into late innings.