1U Firewall Router Server 6x 10GBE E3-1270 v3 16GB X10SLH-LN6TF X10SLH-N6-ST031 | eBay
Compact 1U Full Depth Rackmount Chassis that fits into standard Rack Cabinets. Supermicro 1U 4x 3.5" Drive Bays 1 Nodes full Depth 25". NIC: 6x 10GB Ethernet RJ45 Copper Ports Onboard. Motherboard: X10SLH-LN6TF (MBD-X10SLH-LN6TF-O, similar to X10SLH-F but has 6x 10GB NICs).
www.ebay.co.uk
Sounds a good base for a cheap and cheerful pfsense plus ssd storage server