If I were to recommend a cpu I would recommend the Intel core i5 2500k or the Intel core i7 2600k both are used by a huge number of members on this site and are easily overclock-able. I currently have a 2500k and run it at 4.5 GHZ with no issues at all. (or you could wait for Ivy bridge, no idea on the dates (sorry)); I would stay away from AMD they are currently a quickly sinking ship
As for the dual screen and max settings: That is determined by the graphics card. I currently have an AMD HD 6950 I run 3 screens (3840x1024) at the max settings on WoW, RIFT, and BF3. I believe that anything in the 68** or 69** range should be good for what you are looking for. Another note if you want to run in dual screen mode for games you need a card that runs eyenfinity (2 monitors, 1 resolution)