Best available WW pitcher??

[mlymon77]

I'm sitting on the edge of my league's playoff picture, but I feel Johan Santana is a serious liability at this point. I'm currently looking at pitchers like Patrick Corbin, Dan Straily, Matt Harvey, Jose Quintana, Alex Cobb, and maybe even Jason Hammel (coming off the DL soon). Anybody have any thoughts on whether I should replace Santana with any of these free agents, and what their value might be for the rest of the season? --thx