Take the extra grand and invest in some sweet peripherals. A nice gaming, led keyboard, good mouse, controller or two if you like, an ssd, and extra 2tb hard drive to dump fraps videos on(if you record), some cyborg gaming lights (they're super kewl)... Maybe a fancy chair? lol...
Point is never squander a bloated budget, mix it around and look for other ways to spruce up your experience beyond raw power. Some extra input devices, peripherals, flash drives, perhaps an extra monitor or two... Maybe some specialized gaming stuff even, such as racewheels or flight sim controls, if you play those genres.