Little advise about CPU and graphics.
If you only use the DAW for audio productions (no video editing, or audio for video production), then it is also very well possible to use the onboard chips from the Intel i7 series and up (not so familiar with AMD). The 'k' series have an Intel 4000 or HD graphics adapter on the CPU itself that can very well display software like C7 etc, without a separate Nvidia/ Ati GPU. They even support dual monitor setups (or even HDMI) depending on the MB ouput options.
I work with multimedia, so I use a GTX 650 GPU in my system, however, I had some issues with the card a while ago, and I was really surprised by the graphics coming from my i7 3770k CPU during the RMA process.