Actually I agree with the previous poster - there should be a Mac as well as the Mac Pro. It would cost me around £3700 to get a Mac Pro with the spec I want. That's about £1700 more than I'm willing to spend. The Mini doesn't cut it and the iMac is an all in one that I will never buy
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What is it that the "Mini" will not do? Not what hardware is it missing but what will it not do? The high end Mini had a quad core i7 and is SSD based. The HD4000 GPU could be better but I can run multiple 1080p video in the time line on FCPX.
Currently about the best desktop Apple has is the MacBook Pro Retina with a thunderbolt display. I think the Retina MBP is the desktop you've been looking for, just close the lid and plug in a big monitor