You have a budget? The psu required for the r9 280 is 550 watts so I would get the cx600 unit. You may have a space issue with the video card in a microatx case. Probably would also go with the new 1151 socket at this point.
The only thing I'm concerned with is the size of the video card in a micro atx case but everything else will be fine. Do you have an operating system already? You know you can't reuse an already used key unless its a retail key and not an OEM?
hey.. i like that build?? will that work for me if i just play American Truck Simulator? a game that requires a recommended spec of 6 gb of ram, 3.0 Ghz processor, and a 2 gb video card... i mean seems to me plenty. i dont need nothing crazier.