That looks fine. Now to check that the DSP version of bluez-utils was installed correctly, check the modification date of the following file (which comes from that package):
/usr/lib/gstreamer-0.10/libgstbluetooth.so

It should be the 6th of July.

When you talk about not seeing output from mplayer, were you running it from the command line, or from the GUI menu? Some data should be output to stderr if you are running the DSP version, but perhaps this is piped elsewhere if you start it from the GUI. Try running mplayer from the command line and see what it says.