What IS interesting, and one of the deeper areas of the Top 50 is the "Dempster diving" (pun fully intended) - a good number of pitchers with some solid "depth starter" upside who should not require a giant commitment. Among them:
Paul Maholm, Josh Johnson, Scott Kazmir, Dan Haren, Tim Hudson ... Phil Hughes and Jason Hammel more a prime candidate for a relief conversion
Jesse Crain, Grant Balfour, Joe Nathan are interesting relief options although the price could spiral too high quickly there