I have a older desk top computer in which I would like to upgrade the video card, but I am not looking to go all out, its my kids and I want just enough of an upgrade that he can play the middle range video games. I currently have a Nvidia GeForce Fx 5200 and I am looking for a GeForce 6600GT series or better. Any idea where I can find the older video cards or could you suggest something compatible that does not require a new mother board to support it?