Some good feedback in here.
The WDTV Live seems to have some issues with streaming content over the network, especially if the files are large. Otherwise, the player seems pretty solid.
Most other players seem to have issues of one kind or another. The best one seems to be the Dune, which is simply out of my price range.
I'm also thinking about upgrading to an Oppo Blu-Ray player. Can anyone comment on the file support for that?