I'm enjoying reading all of the commentary, but I have to admit... I do NOT agree. As an IT professional, I've noticed a continuous trend over the past 8 years or so.... & that is: CPU is the least important component in a home/business computer. This occurred right around the 3.06 ghz Intel Pentium IV w/ hyper threading. From about that point on, I haven't upgraded any personal, or any client's processors. It just doesn't make sense. The processor is NEVER the bottleneck in performance.
The money/time/energy spent upgrading a CPU would be MUCH better spent on
either the RAM, video card, or hard drive.
A spinning HDD will ALWAYS be the slowest point in a desktop system. Thankfully the popularity of SSDs & Apple's clever Fusion Drive solution seem to be solving that particular dilemma. Next, with demanding apps... a nice chunk of RAM is appropriate. I've yet to see a non professional Mac setup in need of 16gb, but 8gb certainly is a must. Next, when it comes to high end video apps... or games (probably two of the most intensive tasks you could perform on your system), a video card upgrade trumps all else.
Since all three of these upgrades are available on the new mini... I'm not seeing a huge issue. From what I see; the sweet performance/price spot is $899 for the 2.6ghz i5, w/ 8gb RAM, Iris graphics, & a 1tb Fusion Drive.
I think in almost any typical environment, you could expect 6-8 years from a machine specced like that.
If you are VERY demanding on your home system, but still don't quite need a Pro... the $200 to up it to 16gb would be worth it, and after 8 years- would be a $25/year outlay.
This is the upgrade & price I've been waiting for.
I will NOT be sitting this one out.