I've got
all of my consoles hooked up simultaneously to a 27" RCA CRT with Component, S-Video and Composite inputs. The 8-bit through 16-bit systems are all hooked up with S-Video to the CRT, or if I want RGB I have an RGB to Component converter for that. All of the systems are also hooked up to my 40" Toshiba LCDTV, which doesn't have S-Video, so I downscale S-Video to Composite, or swap out systems hooked up with RGB to HDMI 720p adapter. I play all of my games on the 40" in Game Mode, and pretty much only use the CRT for light gun games.
I only have a current pic of all console cabinet, the LCD TV is to the right of it in its own shelf unit with games above it and speakers below it.