I dont know man this kinda depends on how many pts they get for innings pitched, wins, and saves. The way I see it, Soriano is the RP now that Smoltz out. Torres could lose it, but see if someone dropped Jason Isringhausen and pick him up. Even still though, I think I would do it. Gonzalez is breaking out and though Lyon has been doing well, he is still young and not a dominant RP. And Dice K is awesome, hopefully he'll come back healthy. I'd go for it. No use having so many RP's on a roster anyways I suppose.
I have some of these players on my teams so I've been following them, you should come play fantasy football against me at www.AnyGivenSeason.com and win some muuula dude.