Another week, another pair of IBuyPower gaming desktops to tempt your ever-stressed credit limit. This time, we’ve got the Gamer Fire 640 and Gamer Paladin F830, both of which check in under the $2000 ceiling and aim for the mid- to high-end gamer. Also, these each are outfitted with NVIDIA’s GeForce 3D Vision and come bundled with a Samsung 22″ 120Hz monitor, giving you the perfect excuse to upgrade if you’ve been interested in immersing yourself in the third dimension.The main difference between the two systems