But I would want to make one thing clear that i7 would be a very good option if you are planning for a Overall multimedia system...
But if you want the PC mainly for gaming, then even I would suggest getting a E8X00/Q9XX0/ Phenom X3 or X4 build over an i7 build as the i7 doesn't offer significant gains over the above said CPUs.
With the money saved on the CPU and Mobo, get a more powerful graphics card...