The BlackArmor NAS 4xx products have dual gigabit Ethernet, four USB 2.0 ports, four HDD bays, hardware-based encryption, remote access via any popular web browser, and various business-minded features. For instance, they ship with 10 licenses for backup software along with support for Active Directory 2003/2008 and up to 50 workstations.
Seagate is charging $400 for the NAS 400 and you should save a bit of cash by purchasing hard drives separately. The company tacks on between $200 and $300 for every 2TB HDD, which is
far more than you'll pay for something like the Seagate Barracuda LP, Western Digital Caviar Green or similar "eco-class" drives.