I have decided to replace my old linux NAS box (Dlink DNS-323) to improve the speed when serving up files via SMB. I don't need any HTPC or media use. Just want the fastest NAS to the many MacBooks we have in the house. My current home network has a gigabit switch and a router that supports 802.11ac. Would an older Mac mini suffice? If so what speeds can I expect from it as a NAS?