I have 200 dollars to spend on a video card. right now i have a radeon 9700 agp, but i am open to nvidia as it seems they are cheaper right now. what i am looking for is 256 mb gddr3, agp8x. As i am an ati guy right now i don't know what are the good brands for nvidia cards. it looks like a 6600 or 6800 is best choice for me. what are good brands and any specific cards i should look at? the video card is part of a upgrade including 1 gb (2 256s dual channel) ocz memory and a 3 ghz proc (would go amd but already have a solid p4 mobo)