So, with Xmas coming up I've been thinking about what GPU I wanna get and I've pretty much narrowed it down to 2. I play at 1680x 1200 and I want to be able to handle almost all games maxxed, maybe for the years to come as well. So, basically, which one of the two is better? GTX 570, or Radeon 6870? Also, I have a stock i3-540 ( which I will OC so it won't be that much of a bottleneck) and 4GB of RAM.