Just curious. I have been researching and thinking about investing in a GIGABYTE GV-N670OC-2GD GeForce GTX 670. I have a Sapphire ATI Radeon 5850 1gb and want to sell it, yet every site I look at either says 300 or 700. I have had it for about two years and runs flawlessly with no gimmicks, yet I am confused about how much it really is worth. I wanted to sell it for about 200-300. Is this wise? Just want to get a solid opinion from others. The cost, the switch, ect ect.