Let the hive mind of Engadget get that for you.
"As someone who doesn't reside in the USA, I was wondering what would be the best way to get internet for my computer in the US for a couple of weeks? If it were Europe I know I'd look for some prepaid data. Is there anything similar offered by American carriers? A MiFi or a data SIM that I can tether from would work, but I'm trying to maintain a tight budget. Help!"
Most of the commenters here are missing the point.
Can you build a machine for less? Sure. I just built a machine with a remarkably similar spec for under a grand. No, it does not have the same case, though that does have a bearing here; HP recently sold a batch of Blackbird cases for over $1K a pop (and, yes, that Firebird case IS carbon fibre). The case alone is a big part of the cost difference.
More important, though, is the idea that this represents a more "responsible" gaming rig, attempting to provide performance with lower power consumption. Most of us "hobbyists" would be hard-pressed to build a machine with this spec that typically consumes less than 400W.