Remove gtx 260 it is outdated and overpriced.
The ATI 5770 and GTX 260 perform about the same. Sure the 5770 has "DX11", but I can't picture calling the GTX 260 "outdated" while pushing an ATI 5770 at the same time. Performance level is basically the same.
And honestly, I wouldn't buy an ATI 5770 just for the DX11 difference, unless you're playing at a low resolution.