Keep in mind the GTX 560 series is limited to 2-WAY and that's it you're done. That said and assuming you have either an i5-2500K or i7-2600K the ASUS P8Z68-V PRO or Gigabyte GA-Z68XP-UD5 plus a good e.g. Corsair Professional Series HX850.
BFBC2, SC2, Skyrim (when it comes out), etc. Those would run at max detail fine, I'm thinking. And I would be using 1900 x 1080, unless I get a new monitor. My current computer runs the games fine, I'm really just building one as an experiment. Thanks for your help.