You said "new build" which I assume means you have an "old build". You should temporarily use your old dvd player, mouse, keyboard and headset if you want to stick with the i7 750 build.
I also try to buy Intel and Nvidia, but not at the expense of performance.
The motherboard you picked is one of the cheapest Asus motherboards they make. I think it is the cheapest (2) (1-16X and 1-4X) pci-e slot motherboard they sell and while it supports Crossfire they make no mention of SLI but you want to buy an Nvidia Video card.
Even the GTX 260 is on the verge of being obsolete. They keep making games and apps that require more and more power. And considering you can't even SLI another GTX 260 into the system later for more power it's a poor choice.
The Corsair memory is over-priced for the performance. This would be a much better choice.
Newegg.com - G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL7D-4GBRM
I like the case, hard drive and power supply.
When it's all said and done the AMD system Muffin Man setup is going to be the better setup for the money you have.