I wonder if this is Apple's way to say that they don't like to sell desktops. Mac Mini, Mac Pro, iMac.
What difference would it make? Even if you got a desktop from Apple you'd still get a worthless video card, either an ATI 5770 in a $3,000 'Pro' computer (i use the term pro loosely) or an bigger joke, a Mobile graphics card slapped into an iMac.
Youre better off just using a laptop as its at least portable.