I still dont think the it would cost as much as a Mac Pro. Those things are VERY expensive but they also out perform nearly anything out there. I wish Apple would come put with something inbetween the Mac Mini and Mac Pro. Most people want a little more then what the Mini offers and need much less then what the Mac Pro offers.
I know there is the iMac but something without a built in screen and thats just a desktop would be FANTASTIC!