That's my feeling to I don't think the Mini did as well as they were expecteing. Can you put a SSD drive in those Mini?
If you want to have something upgradeable, not spend much and upgrade it with SSD drive(s) then you may want to look at getting a used 2012 mini off of eBay (someone commented the other day that they're down to $560?)
These really weren't designed to be customer-serviceable, so unless you're mechanically inclined and comfortable taking electronics apart you may want to get either your local mac repair shop or a friend that IS so inclined to do it for you.
To give you an idea - there are guides on ifixit and videos on youtube showing how to add an SSD to a mini (I recommend adding, then using the original, slower drive for your iTunes library, etc).
ifixit also sells the kit (connector and tools) that you need to do the upgrade.
https://www.ifixit.com/Guide/Installing+Mac+Mini+Late+2012+Dual+Hard+Drive+Kit/11713
I myself have been using a 2012 mac mini (bumped up the memory to 16GB) as a HTPC and my primary home computer since it came out (connected to a 65" plasma TV via my Pioneer AV receiver).