HP N54L.
4x 3.5" internal drive-bays with trays (no hot-swap), 1 External 5.25" bay, 1 internal 3.5" bay, 2 PCI-E, 8 GByte ECC, takes 4 TB drives, 6 external USB2, 1 external E-Sata, 1 GB/s NIC. There is an HP-ILO Card for out-of-band servive - access to bios, power down. 1 internal usb (could boot OS from USB...)
excellent VPN / and storage server (VPN ~ 340 MBit/s AES 256 throughput) (put VPN Server in virtual machine)
mini-server ist suff. powerful to run data server at high speed. 5x4 TB raw ~ 16 TByte Raid 5 storage size, 1 additional external hot spare possible.