I use AABBNNNNRRRR where AS is the initials of the School, BB is either DT for a desktop PC or LT for a laptop, NNNN is an asset ref number (my school went through an inventory early last year where sticky labels were stuck on anything with a plug), and finally RRRR for a room number). Been doing that for just under a year, when I re-image a PC. Done about 170 of 500 or so devices bso far, mostly for performance issues. Seen a lot of legacy x86 builds that I've been finding any excuse to update with x64 builds from a now functioning MDT server, even got it to deploy the correct drivers based on manufacturer and model!