Cabrera from Washington seems like such an easy answer, but I haven't heard any rumours about him other than Mike Ferrin and Jim Duquette saying the Nationals should trade him on the radio a few days ago.
It's such a crazy season, Washington may not be willing to sell. The second place Marlins and Phillies are 14 and 15, so even the nationals at 12 and 19 aren't completely out of the playoff picture. You'd think with the loss of Strasburg, they'd throw the towel in and get rid of a piece like Cabrera.