I was just in the Apple store and saw a Studio Display hooked up to a Mac mini. Plop one on top of the other, or buy a bracket and mount the mini under the desk and you wouldn't even know it's there.

While I can see a place for the smaller, more colorful iMac in some environments, the Studio Display/mini or Studio Display/Studio combo makes a lot more sense in terms of modularity, upgradeability, and from an environmental perspectice.