I'm building a new gaming pc and I've seraching for the appropriate graphics card. The thing is I dont know if I shall go with the MSI R9 280X Gaming, the XFX black edition or the new Sapphire VaporX TriXX.. Which one would you choose? I discarded the Asus DCUII Top due to the artifacts.. In addition, could I do with a Corsair CS650W 80 plus gold power supply? Thanks.