How come when I'm looking at the pictures of video cards that are listed on ebay; they look different compared to the ones listed on this web address - http://www.gamespot.com/features/6156859/p-16.html. I know that they are generic 3rd party brands but when I search for specifically ATI radeon and nvidia geforce, they are listed. Are they just as good? or am I better off buyingbrand name. HELP ME NAH!!!

I just bought a Dell Dimension 5150 with 3.0 processor and 512mb ram (soon will have 1024mb) but I need a PCI express video card. I really want to tap in to the PC Gamer world. I need a budget graphics card with 256mb memory on it. Which one should I get?