I have been using the MSI 790FX-GD70 for some time now. Though mine is in active service for my media center, not gaming. I would suggest any of the 890FX or 990FX platforms from a reputable company. Be it MSI, Asus, or Gigabyte.
Just for confirmation's sake, either one of these along with the CPU I mentioned WILL let me play some higher-end games, like BF3 Red Orchestra 2, Wargame, etc., right? I just want to be extra sure, so I don't end up wasting my time and/or money.