Ok. I have a dimension 8200 with an upgrated cpu of 2.8 ghz and ram of 768 rd ram. Agp 4X and 400mhz bus. I want to upgrade my graphics card gf2 to a geforce 6800 gt. I will buy it this christmas after the prices drop once more. First question: Is this card my best choice? Second question: What is the best brand name to buy? XFX and Evga seem to be the cheapest.