Basically what Vulcan and Photon said. In addition, don't overlook the power supply, many cases come with average power supplies. With your video requirements you will most likely be looking at a video card(s) that require dedicated 12V power. Depending on the video card setup you may need up to 4 12V lines, either 6 or 8 pin connectors.
Basically, decide what video card you are getting and then make sure the power supply has sufficient lines to power it.
I just built a new system in November with the i7 920 and it is fantastic for the price.
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