Hmm.... well, my main setup is a 52" 1080i Projection TV, Sony 5.1 DTS/DD Surround System, and I currently have my Clear XBOX, my XBOX 360, my PlayStation 2 Slim, and my Nintendo Wii hooked up to them with a 4-way Component switchbox. This setup resides in my living room, and only gets played usually when friends come over.
However, both me and my wife have our own personal XBOXes though, and they get the most attention out of any of my game systems. My personal XBOX sits right next to my PC with a custom VGA cable going to a 19" Acer LCD, and my wife has her personal XBOX in our bedroom on a normal 27" TV.

If you are interested, you can find pictures of my XBOXes in the link in my signature.