R9 270, R9 270X, 7950, 7870XT, 7870 $150-200 range all good options for 1080p
R9 280X if 7970's are not available are also in the $300 range.
R9 290 is $400-450 once the custom cooled ones come around, they should be a viable option
R9 290X $550-600 once the custom cooled ones come around, they should be a viable option.
So you can pretty much take your pick with that CPU at the budget you have.
Does the graphics card need to fit the case an dif so how do you know it will fit it?