Personally, I find a 32" screen to b e perfect for that distance. That way, the screen is big enough to encompass most of your view, but isn't so large that you get lost in it.
I personally recommend getting a Samsung UN32EH5000. It is a $300 32" screen with a native resolution of 1080p. I picked up 3 for my triple monitor setup, and I am absolutely loving them!http://www.amazon.com/Samsung-UN32EH5000-32-Inch-1080p-Black/dp/B0071O4ETQhttp://www.newegg.com/Product/Product.aspx?Item=N82E16889102667