Newegg has the Synology DS918+ 4-Bay Diskless NAS DiskStation Network Storage (2017 model) for $600 - $30 off with code EMCBRBE26 [Exp 10/15] = $570 with free shipping. Features quad-core Intel J3455 processor with AES-NI hardware encryption engine and 4GB memory (expandable up to 8GB).