I'd keep Schilling, Soriano, and Chavez. All 3 of those guys are guarenteed 1-2 round picks. There would still be a chance that you could draft Mulder or someone similar when you draft in the 1st or 2nd round, but if you let those other guys go someone will snatch them up asap.
Also, you gotta figure there are a lot more good SP available then 2B especially where the crop is VERY thin.