Xeon gaming/editing build 400-600 pounds

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Looks fine for the budget. Moving up to the R9 290, for a slight bump up in the budget, and maybe getting a better PSU would not be bad ideas. The 280x might struggle with some titles on ultra, depending on the resolution, and the B1 series EVGA PSU isn't really meant to be paired with high end gaming cards. An EVGA B2 series PSU would be better, by far.
Looks fine for the budget. Moving up to the R9 290, for a slight bump up in the budget, and maybe getting a better PSU would not be bad ideas. The 280x might struggle with some titles on ultra, depending on the resolution, and the B1 series EVGA PSU isn't really meant to be paired with high end gaming cards. An EVGA B2 series PSU would be better, by far.
 
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