"One thing that stands out to me about StealthMachines is the quality of their customer service. Before I made my decision to purchase from them, I heard all sorts of horror stories about other manufacturers' poor customer service and this made me apprehensive about the idea of even buying a custom PC. When I came across StealthMachines, my opinion changed due to the way they uniquely provide guides containing useful information on the core components of a PC. This made me more knowledgeable about what I was buying and reflects well on the attention StealthMachines gives to its potential customers. In addition to that, the owner swiftly responded to my queries over email and offered helpful advice when appropriate about my specific PC needs. If you've never bought a custom PC before, I'd advise looking into StealthMachines as not only will they answer your questions and educate you about their products, but they will also provide you with peace of mind through their outstanding customer service.
12/2016 edit:
I recently purchased a laptop in addition to the gaming desktop from here in 2015. I have over 1000 hours of use on the desktop and with good care and occasional cleaning, it hasn't given me any trouble. For the performance of the PC, friendly customer service, and price, StealthMachines is a strong option for high-end gaming desktops."