Monitor Design
What I would like to see is the displays of all sizes connected to the iMac style arm, with a connector of some sort at the bottom of the arm, and no base. For iMac orders, Apple could just snap on or screw on an iMac base to the display. For stand alone display orders, Apple could just screw in a weighted base with adc connector at the back and usb ports at the front.
The base could simply be filled with lead or whatnot. It would jsut have to be heavy enough, so that at the most extreme adjustment to the 23" display, the base does not come close to tipping over.
This would increase flexibility of managing inventory, reducing cost, hopefully to the point that would offset the increased cost of the modular design over the current iMac design. It would also allow Apple to offer a BTO 20 and 23" imac if the base is heavy enough. Over the years when the iMac is outdated, but the display is still great, users could just order a new iMac base, and reuse the display.
This would also work great if the headless cheap mac sold were simply an iMac with a cap at the top instead of the display. Now users can get into a mac cheap, and add the display down the road.
With current offerings, Apple needs an affordable tower, because displays and computers become outdated at vastly different rates. I'd get an iMac, but I can't justify tossing the display when the computer is outdated and repurchasing the entire setup.