The Great Void=iMac. Powerful enough for virtually every application, even professional ones. Only the most serious daily/heavy video/sound editors will find the iMac too underpowered. Stop acting like there is a void between the Mini and the Pro because there just isn't. So you are forced to buy (a fairly decent) built-in LCD. Big deal. They could charge the exact same amount but leave the LCD off and make it in a smaller enclosure. Then you could hook your ugly Samsung or HP monitor up to it and end up paying more overall because you had to buy the monitor. Would that make you happy? Wait--don't answer that.
Sorry, but the great void is NOT bridged in any way by the iMac. They could never charge the same amount for that computer without the monitor and simply make it a smaller enclosure. It would be way overpriced, and nobody would buy it. You could buy a much more powerful desktop PC, plus a 24" monitor, and still save hundreds of dollars. Not everybody who uses a desktop computer needs to buy a new monitor every time they want a new computer.