HP Proliant Microserver N40L is a great NAS or Router
HP ProLiant N40L MicroServer Server System AMD Turion II NEO N40L 1.5GHz 2-Core 4GB (1 x 4GB) DDR3 Microsoft Small Business Server Essential 2011 (pre-installed) 658552-001 - Newegg.com
HP Proliant Microserver N36L 1.3Ghz, 8GB RAM, HP P410 RAID Card, No Hard Disks | eBay
N40L Archives - Shogan.tech
vSphere 5 Homelab - ESX on HP ProLiant N36L/N40L/N54L Microserver | virten.net