I have a Shuttle ST61G4 in the closet at my parents house. Still works, and it's rocking a 3.2GHz Northwood P4 (with HT!). Only qualm I have is that the onboard graphics on it might grow outdated - you know, what if Microsoft makes a new OS, oh, let's call it "Vista", and adds fancy visuals that this card can't handle?
HP 8200/zbook 14/6530b. Pioneer BS22-LR.