It depends on your definition of "best".
As far as quality and performance the Gigabyte mobos are always my first choice. The AM3 socket mobos will run the Phenom II 1100T CPU but if you're buying a new mobo now you might as well get a mobo with the AM3+ socket so you can upgrade to Bulldozer CPUs in the future. The AM3+ mobos will also run the AM3 CPUs like the 1100T.