I decided to buy a Mac mini (to run private web server, as NAS, etc.) and I am not sure whether I should buy the mid-level of the server version. As far as I see the mid-level doesn't allow two hard drives by Apple's configs. But what else is different between the mid-level and the server model? The weird thing is that if I configure both models with i7 2.6 Ghz, 16 GB RAM and 256 GB SSD, the mid-level version is even cheaper. I already have the server app, so would it even matter what I pick? Or is there something else I don't see?