I'm going to need a few new physical servers running Ubuntu Server (12.04 LTS then upgrading next year to 14.04 LTS), and I'm wondering what is the difference between choosing a server from the 'Ubuntu Server certified hardware' list (http://www.ubuntu.com/certification/server/) vs building my own?
I understand the need for hardware certification for laptops or desktops, where things like hibernate/suspend, WiFi, video card, etc are important. But what's the need for server certification? And what risks are there (in terms of compatibility with Ubuntu Server) with building my own physical server vs choosing an Ubuntu-certified server?
(I understand that when building my own servers I won't have a warranty, but that's fine because the servers are not for mission-critical use. I can handle downtime in order to replace any failed components.)