Dempster so far is 2-3 with a 2.31 ERA in 11 starts this season. He has 63 K in 74 IP. For his career, he is 114-119, 4.34 in 530 games, 305 starts. He also has recorded 84 saves while spending the last nine seasons with the Cubs.
I think the Dodgers are the favorites at this point. They have need in their starting rotation with the injury to LHP Ted Lilly. There is every reason to believe there is a committment to winning in the front office, led by the recent purchase of the team by the group led by Magic Johnson and Stan Kasten. It has been further proven by the recent extensions given to OFs Matt Kemp and Andre Ethier.
The Yankees always feel like they need depth in their rotation. Their starters, however, have gotten the job done recently. The Reds, one of Dempster's former employers, could use the depth also. I will also include the Angels and Tigers as teams who will check in.
As far as Garza, the price for him will be too high to get anybody to bite. I feel strongly that Theo Epstein will hold on to him unless he gets blown away. He has a number of players on that team that he will be able to move in some way, shape or form such as Brian LaHair, David DeJesus, Alfonso Soriano, Carlos Marmol and Geovanny Soto. The future of the Cubs is not predicated on trading Garza.