I hate mulder. My pitching hates mulder. My team needs help

[Quadron]

I'm in a 10-team 5x5 H2H league.
I'm in 3rd place - fluctuating between 1st and 3rd all season - and I'm hoping that my flurry of recent trades, which netted me Mulder and Pettite, along with my pickups of Brazoban, Haren, and Westbrook will help to bolster my struggling pitching staff.

My Roster now:
Pos Batters
C M. Piazza (NYM - C,1B)
1B M. Teixeira (Tex - 1B)
2B M. Giles (Atl - 2B)
3B F. López (Cin - 2B,3B,SS)
SS R. Furcal (Atl - SS)
OF V. Guerrero (LAA - OF)
OF M. Ramírez (Bos - OF)
OF C. Lee (Mil - OF)
Util D. Ortiz (Bos - 1B)
BN V. Wells (Tor - OF)

Pos Pitchers
SP R. Oswalt (Hou - SP)
SP R. Harden (Oak - SP)
SP A. Pettitte (Hou - SP)
RP M. Rivera (NYY - RP)
RP J. Isringhausen (StL - RP)
P Y. Brazobán (LAD - RP)
P M. Mulder (StL - SP)
P D. Haren (Oak - SP,RP)
BN C. Young (Tex - SP)
BN J. Weaver (LAD - SP)
BN J. Westbrook (Cle - SP)
BN C. Lee (Cle - SP)
DL A. EatonDL (SD - SP)

My pitching is still the downfall of my team.

There are some pitchers on the FA list that I have on 'watch':
J. Lackey (LAA - SP), A. Harang (Cin - SP), M. Redman (Pit - SP) , G. Rusch (ChC - SP,RP) , K. Wells (Pit - SP) , V. Santos (Mil - SP) , S. Ponson (Bal - SP) , G. Chacín (Tor - SP,RP) , S. Kazmir (TB - SP) , B. Halsey (Ari - SP) , J. Blanton (Oak - SP) , K. Davies (Atl - SP)

Any of them you'd advise me to pick up?
Also, what do you think it would cost me to trade for a top pitcher?

[statsman88]

If Harden comes back in his ace-type form, you will be a top team.