Apple Mac Mini 2.5GHz – 3.2GHz Intel Core i5 4GB RAM 500GB Mac OS X 10.12 Sierra
This Mac Mini from 2011 sells for about $400.00.
There are two upgrades you can do to this particular model. The first is that you can upgrade the RAM to 16GB which is getting rare for Mac Minis as you can’t even upgrade the lastest model. This will cost about $100.00
Then there’s the hard drive. It comes with a 500gb spinning drive which is okay if you don’t mind the speed and need the storage, but if want a much faster experience for this 2011 Mac Mini then you should upgrade the SSD. You could replace the 500gb spinner with a 500GB SSD. This will cost about $150.00
Total it all up and your maxed-out 2011 Mac Mini would cost about $650.00 and the result would be a very fast Mac Mini