Well based on what the testimonials from digital storm I really liked what people had to say. I'm sure those other companies are good but so is the machine he has in front of him. Although the xotic pc prices are really good. Ava has me a little confused because they have brands like msi tagged to there product so it makes me think its not an actual product from them.
What they actually do is they buy it from the original manufacturer, and then make custom mods to your order and then add a fee, and send it to you. Same thing with Xotic