With innings as a stat, and most of the cats focused around SP's, I really hope you have a transactions limit, or people will be churning pitchers like crazy.
I think that you should wait to get closers until guys like Julio, Chacon, and Graves are around. That way you aren't losing much for your SP's, but you still have at least some saves. So target the guys who might have a bad ERA/WHIP but will still get you the saves. With so many IP flying around, the small amount of ER's that your closers give up won't matter as much.
"Jack, will you call me, if you're able?"
"I've got your phone number written, in the back of my Bible."