http://www.pcdirectuk.com/media-cent...ront-audio-usb
Looks like your motherboard is standard ATX - and there are only a few Media Centre Cases that take a full ATX.
There is also the rather pricy Fractal Design Node 605 - and only supports a slimline optical drive, and not even that with a full ATX board.
Not sure if the height of these requires a low profile card, or if the slots are full height
Thermaltake DH202 looks like another full ATX capable, and looks like it is full height
Silverstone GD08 review says it takes a full size HD7970