The four remaining mid-tier options are Edwin Jackson, Lohse, Marcum, and Dempster.
Jackson is starting to seem to be the far best option of the group. His last team is already out of the running, and he's probably not a good fit with many of his previous teams, which eliminates most of the contenders.
I keep looking at Kyle Lohse, and I can't figure out why anyone would want to sign him long-term. He's 34 years old. He's been absolutely spanked by American league teams in his career-- If you look at his career numbers, he only has good splits against teams like Houston, Cleveland, Tampa, Pittsburgh, etc. Dempster too, is a NL pitcher at best.
Marcum has had arm and shoulder problems, but hell, you can probably sign him AND Jackson..