The only comment that I have, is that you're going to want to sit closer to the TV when your playing the PC games, otherwise, it will look pretty much identical to gaming on a Xbox, and if that's the case, then what's the point, just get a Xbox.
What I do, when I'm gaming in my living room, is I take the Loveseat (opposite to the main sofa), and turn it sideways, and move it about 5 feet from my 50 inch plasma. If I didn't do this, and was just sitting on my regular sofa in it's normal position, I would be about 11 feet from the screen. I've done that before, and I was disappointed with the results. I could barely notice a difference between PC games and Xbox 360 games, and that includes the fact that I was running the PC games at a "true" 1080p, while many of my 360 games aren't even running at a true 720p.
The problem was the distance from the screen.