I get quite annoyed with people just keeping on dumbly repeating that the quad it is a better processor. A better processor for what?
If the software is single threading then the faster speed of the duo core has an advantage, also turbo runs to a higher speed. Not to mention that both the base and the server mini do not have a processor capable of virtual IO which is imprtant if you are doing virtualisation. And the latter is rapidly creeping in: if you have some software that only runs under windows then you'll want to run parallels.....
And then not to talk about the 29/59 frame error of the integrated HD3000 GPU.
So while the quad may have "more computational grunt" it does not mean that it is the best, I would even go sofar as that the i5 and i7 CPU's are faulty and that in the mid mini there is a work around with the GPU fully functional.
You're right, but the Quad is simply a joy to use, and it crunches video encoding like a small snack.
I would personally find it a bit difficult to get the mid-range Mac Mini *and* do processor and hard drive upgrade with Apple, and end up paying more than the server. Plus, having two hard drives out of the box on the server. The server just feels like a better deal.
Nevertheless, perhaps in a home media center environment, the mid-range model base is a smart move indeed with the GPU, and why not save $200 in such a case? Probably don't need the power there unless using it to crunch video in its spare time, while you would need the GPU for the error you mention.
Two very different uses though (top power (in this compact category) desktop PC versus media center). Those who want light gaming might choose this too.
I just love this server for my primary desktop PC. My old 2009 Mac Mini is still a great PC for my TV.
Therefore, I apologize for promoting the server model so much. You're right, the mid-range machine has its strengths, which is why Apple offers it. Hey, I wouldn't mind having one of it too! I just don't know how much sense it makes to add all these extras onto the mid-range model and get its price so high (I feel similarly about adding too much to the server model).