SP Michael Lorenzen
Lorenzen is getting a bit more buzz right now because he'll be easier to acquire. He'd be a rental, so he wouldn't cost too much. Plus, he doesn't necessarily have to be a starter because of his bullpen experience.
There are other reasons besides his pitching ability that could make him attractive to other teams. He's a veteran, so he could beneificial to an up-and-coming team like the Reds or Orioles. He's also a great clubhouse guy, and that's more valuable than you think.
Lorenzen is a solid back-of-the-rotation starter, and contending teams always need arms. He could help somebody out.