ExtremeTech has a graphics card upgrade guide up in response to all the great PC games that have been released and are going to be released this fall. If your looking to upgrade soon, you might want to read through this guide. I just upgraded to a EVGA GeForce 8600GT this week, and I must say that I am impressed with the performance you can get out of a card you can get around $100. I got mine for $110 and it had no problems running the Call of Duty 4 demo at 1280x1024 with 4x antialiasing turned on.
In addition, you should also check out the Tom's Hardware article, best gaming graphics cards for the money in October. With high-definition games like Crysis, Unreal Tournament 3, and Assassin's Creed coming out soon, and with graphics cards taking a price cut recently, it's a great time to upgrade. The Extreme Tech guide does mention a new nVidia card rumored to come out around November that will be in the $200 range. You may want to wait around to as close to Christmas as possible before finally deciding on a card if that's your price range.
