Both the Nvidia GeForce4 Ti 4600 and ATI Radeon 9700 Pro are nice graphics cards. I would go for the one that you can afford. I can't say for sure if the Radeon 9700 Pro is worth the extra $100, since I've never used one before. It basically boils down to how much money you want to spend and if you prefere Nvidia or ATI products. Either one is a good choice and its a win, win situation.