I just bought my first mini this last Monday. It is the 2014 base model. I went with the base model because it has similar specs to any computer I have used since 2010. Since my habits haven't changed any, decided anything more would be wasted money. Not even sure if I feel like going to the hassle of installing and SSD in it right now, since Sierra seems pretty peppy even with the 500GB HDD.
As far as overall Macs owned, this is my second one. I own an early 2008 white Macbook that use to run Lion. Bought it back in 2014, but have since upgraded it to 3gb of ram and replaced Lion with Windows 10 Pro 32-bit. I originally bought it just to toy around with OS X, and I really liked it, but didn't have much money for a newer Mac, until recently when I noticed the Mac mini was cheaper than the System76 Lemur that I bought two years ago (yes, I am a Linux convert).
My wife will now be taking over the System76 and giving her laptop to her mother who needs one. I'll be keeping the old Macbook since it works just fine as a laptop, and I like playing with Windows 10 as well.