first timer with slumping team

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Hi Everyone. I'm a first time poster and first time fantasy baseball player. I was wondering if I could get some advice. Right now, I'm in a 11 team yahoo roto league with standard 5 by 5 cats. My team is
C=Posada
1B=Ryan Howard
2B=Cano
3B=Garrett Atkins
SS=Glaus
OF = Ichiro, Rowand, Dye
Uti=Konerko
Bench=Furcal, Orlando Cabrera, Ibanez, Adam LaRoche
SP=Halladay, Sabathia
RP=Lidge, Chris Ray
P= Henry Owens, Dan Haren, Bedard
Bench=Burnett
DL=Phil Hughes

I have lots of buy low candidates such as howard, cano, atkins, ichiro, konerko, etc. I think I need closers but there are two teams in my league that basically drafted all of the closers and are overpricing them. Any other tips or advice would be appreciated. Thanks.