Thanks for your help.
As for your list, they all feel pretty close to streaming pitchers. Basically, you should be able to find equivalent type players on the waiver wire day-to-day, so I don't feel like dropping any of them is that big of a deal unless you are in a really deep league (say 12-16 teams). If you have to choose, I probably would drop Liriano, Cobb, or Tillman. I like Detwieler, but he won't get you Ks, although he's probably the best pitcher listed there. Karstens is not flashy, but is solid. Also will not get you K's though. And Scott Diamond is good with spot starts (as are most of these guys). I would advise dropping Tillman though.