Which RP is the weakest link?

[galacticat]

Through autodraft misfortune I have more relievers than I need. I want to drop one to pick up a free agent SP (there are several decent options available in my league). I have:

Papelbon
Nathan
Qualls
Francisco
Lindstrom

No one is interested in trading me for one of the lower tier guys, and so far I'm not getting the right value in return for Papelbon or Nathan. I think the best guy to drop would be Lindstrom. Qualls and Francisco appear to be solid in their roles and they are healthy. Lindtrom's health is a little more questionsable, and the Marlins probably offer fewer save opportunities in general. Agree that Lindstrom should be the guy to go?