Rafael Soriano, Taylor Tankersley, or Duaner Sanchez?

I have Soriano right now, and one person has told me he's great and not to get rid of him. However, I have no reliever with saves, even though I have a waiver request for Salomon Torres that will most likely go through. So I am leaning toward dumping Soriano for Taylor Tankersley, a free agent closer for the Marlins, or Duaner Sanchez, a setup man with a very low ERA for the Mets. Soriano and Sanchez are both coming off injury, and Tankersley has never closed, so what should I do?