:xoutpost:
Congrats on your purchase. There is a lot of info on this site that will be very useful to you as an X5 owner.
I am sorry to say that the premium DSP stereo is not surround sound. The changer will play regular audio cd's... you will need to go after market if you want to play DVD-A or SACD audio discs, or DD5.1/DTS DVD movies. The X5's audio system is not the greatest OEM system out there, but there are some relatively inexpensive upgrades available for the X5 sound system which improve it quite a bit.
Get us some pics soon of your new ride