Well, remember, the $5,150 USD is for the full-featured model (64GB RAM, dual SSD/RAID 0, plus 1TB HDD); the lower-end model (16GB RAM, no SSDs, 1TB HD) "only" costs $4,400.
Although that seems weird, because my local Micro Center is advertising $200 off the "regular" price of the model (http://www.microcenter.com/product/467655/GT83VR_Titan_SLI-055_184_Gaming_Laptop_Computer_-_Aluminum_Black), but they show it having not only the 1TB HDD but also a 256GB SSD , & they're currently selling it for $3,300 USD...which would put the "regular" price at only $3,500 USD. Guess Amazon wants to make sure they're making money off of it, if they're going to increase the price by 25-33%. Would have been interesting to see how the lower-end model compared in performance to the higher-end model, as well.