I want to buy the 27" iMac, but for various reasons - most importantly height - I need to have it hang off a Vesa mount arm that will swing over my desk. Unfortunately, I need the screen to be fairly low, and the iMac stand would be in the way. MY QUESTION: is the stand on the iMac detachable, or not? When you mount it, do you simply have the stand hang below... seems ugly. Any ideas? Also, what is a good arm that would attach to a wall and extend at least 3 feet? TIA!