I want to buy a mac mini, i have the option between a used late 2012 2.5Ghz, 4GB, 500Gb HDD, and a new late 2014 2.6Ghz, 8gb, 1Tb HDD. By the price of the 2014 in it raw specs i can buy the 2012 one and buy 4 or 8+GB of ram and a external SSD to run the system on. Would it be worth purchasing the old one if it is working with no hardware problens? will it be slower than the 2014 model? i saw a lot about the 4 core models on the internet, but how it would compare (CPU wise), as booth are 2 core models? Thanks in advance!