High end case, expensive processor, lots of ram, Windows 7, SSD?  None of that does anything but waste money.

With ASICs being shipped only a fool would be investing in GPU rigs ... but if one does buy a GPU rig other than quality PSU, and GPUs themselves everything else should be as cheap as humanly possible to maximize efficiency (MH/$).   Your $1.75 per MH is horrible.  Downright guarantees anyone buying it will never come close to breaking even.