A 27" would probably easily sit on one of the swivel mounts they sell at Best Buy. Those work well. I bought one for my mother and my girlfriend.

Well, the GC can, I believe, do progressive scan with the right cables, so you should include that in the equation. 27" is a fine size, but that would probably depend on the room. Flat screens also look a lot nicer, especially with video games.
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Matt