$6000 at stake - need advice on Sheets

[baseballboy]

I am in a big $ league and in 1st place - trade deadline is over.
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Non-keeper, 12 team mixed standard 5X5
ROTO auction league w/$260 to spend:
1 catcher, 1B, 2B, SS, 3B, CI, MI, 2U, 5OF, 9P
Unlimited DL/no bench. Daily $10 Transactions
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With a month to go I'm leading the league in strikeouts but must maintain to stay there with 4 teams that could close in. My WHIP is fine. My ERA is 3rd to last but have been doing well lowering it and could gain about 3 spots if I keep it up. I'm 2nd in saves with 95 followed by 87, 82, & 80 behind me (105 is ahead of me). Wins are tight - I'm in 4th with 81 followed by 80, 79, 75, & 72 behind me (90, 84, 83 are ahead of me).

I'm about to activate Ben Sheets and need to drop a pitcher. It can be a starter or closer.

A Pettitte
O Hernandez
R Hill
J Shields
S Marcum
P Hughes

J Isringhausen
J Valverde
B Myers

MY QUESTION: must drop one - what would you do?

What I do can make or break a shot at $6000 - Thanks for your thoughts on this in advance.

[baseballboy]

I moved this to the "Draft, Trade, Keeper, Waiver" forum as it is more appropriate. (sorry)