My advise is to buy a Nexus7. If your X1 usb reads MTP you can even control music from your wheel; you can hide the USB behind the dash it's something my dealer did for $150 + $200 of Nexus7 + $40 station
http://e84.xbimmers.com/forums/showthread.php?t=838703 you have an Android tablet you can take / Navigation System / Internet Radio and more.