There are about eight stock Gamer Xtreme systems, all of which seem to be built around Intel's P55 chipset and Core i5/i7 processors. To select a system, head to CybePower's website, hover over "Intel Desktop" at the top, and then hover over "Core i5-i7 P55 PCs". After you select a machine, simply choose a motherboard with the next-gen parts (either the Gigabyte GA-P55A-UD3 or GA-P55A-UD4P).
Systems are highly customizable, and with the Gigabyte GA-P55A-UD3 I was able to configure a respectable PC for under $930. The build included an Intel Core i5 750, 4GB of DDR3 1333MHz RAM, a Radeon HD 5750, and a 500GB HDD -- not a bad deal if don't have the time to slap your own PC together.