Stealth Machines is a very small company started by a young dedicated individual who has a passion for building computers. Back in 2004 Josef, the company's founder and an avid PC enthusiast and gamer, started building computers for friends and family. Over time this blossomed into a strong business. The only marketing they have done up until PAX East, Word of Mouth.
Take a look at their website. There are only two options: "Gaming" and "Business" There is no extra fluff. It's straight to the point.
What impresses me the most about Josef, is he started this all when he was in High School. Armed only with his doctorate in StarCraft, and enough closet space to act as his laboratory, he set out building computers and hasn't stopped for anything.
I'm thinking of looking him up next time I want to play StarCraft...