1- Yeah the corsair should work without problems, but this G.Skill 4GB (2x2GB) 1600
are much better and with a fewer price. Remember that for run the RAM to 1600 u need set the specifications manually in the BIOS.
2- The 6GB (3x2GB) kit is a waste of money since AMD don't support tri-channel. For that game u don't need more that 4GB even with Crysis that is one of the most hard games u don't need more that 4GB. Just be sure that u have a very good GPU.