If anything just scale the CPU accordingly... it's still a cheaper build overall and the binned Ivys can't be beat for wattage. Check it out, no matter how you spec it, Ivy i7 will always lose the $/W and $/Ghz battle: http://pcpartpicker.com/p/1W2jt
If you wanted more IPC, the Haswell v3 is currently cheaper than the Ivy line in terms of build: http://pcpartpicker.com/p/1W2D2 Total: $304.94 + code NAFSAVE25NOV1R = 279.94 + SR -1.99 S/H = 277.95