looks like it would be a great budget build. Although, i would get a 450vx to power it instead of that xion one. It will up the cost $59 after MIR but the psu is the back bone of the system, the ones that come with cases are usually of poor quality and specs, if you do not want to spend that much on the 450vx, do some research into that case to se what the specs are of that psu.
Newegg.com - CORSAIR CMPSU-450VX 450W ATX12V V2.2 Power Supply 90 - 264 V UL, CUL, CE, CB, FCC Class B, TUV, CCC, C-tick - Power Supplies