Metro 2033 is highly gpu memory reliant, the more gpu memory you have the better in the case of Metro 2033. The two 7950s will work perfect for what you plan to do and are power houses today. At 1980x1080 though a single 7950 can pull through at about 60 fps with everything maxed. Of course that is an average in intense scenes it will most likely go below 60fps. If you are going to run the 2560x1080 then crossfire 7950s can output above 60fps even with 4xMSAA. All of this is specific to Metro BTW and the new AMD Beta drivers give increased gaming performance so you may want to check that out.