There are a few ways to drop the cost on this build.
Most immediate to me is the overkill PSU, you in no way need 750W on this system. I doubt that Crossfire/SLI is going to be a concern. I advise dropping down to this 550W unit.
XFX Core 550W. $70 ($10 rebate)http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013&Tpk=xfx%20550W
Modularity is a useful feature, makes cleaning the PSU easier as you dont have to disturb any cable management. Though at this kind of budget, the extra $20 for modularity can be spent better elsewhere.
You cant overclock on that CPU, so a Z77 board is fairly pointless. Also you don't need some of the other features of that board (such as Crossfire/SLI support), so there is no point paying for them.
This board will do fine.
AsRock H77 Pro4. $80http://www.newegg.com/Product/Product.aspx?Item=N82E16813157302
With the roughly $60 you have saved, I advise sinking it into the GPU.
Sapphire HD7870. $210 ($15 rebate)http://www.newegg.com/Product/Product.aspx?Item=N82E16814202010