Seagate BlackArmor NAS 440

Starting at $1,199.99 (~£815) for 4TB, the Seagate BlackArmor 440 is arguably the most affordable high-capacity, high-end NAS server. Our Editors' Choice winner, the Synology DS209+, comes with no storage and costs £339.95. Although it's designed for the business environment, the BlackArmor 440 is also well suited for the home, provided you have enough networking knowledge (this device is not the easiest NAS to set up and manage).