^
I'd get a stronger PSU, may be the XFX 750 - just for overclocking overheads and case modding / fan stuff. Yes it's overkill, but also will help towards future SLI, if the Maxwell architecture reduces power consumption as much as they did for mobile GPUs
also get a nicer case. You can't get a phantom 410 since the 280X won't fit. May be something like a haf 912.
Or you can chuck in an SSD
also OP do you need a monitor?