I think it's a little unrealistic to go hunting for a PVM or similar RGB monitor. Very difficult to find, and often they aren't larger than 20 inches. At that small a screen, RGB really won't gain you much. If you have the room, I'd shoot for a 27 or 32 inch CRT by Sony or Samsung, with the flat glass, and component and S-video input. Then get a $50 SCART to component adapter. While Nintendo consoles SNES, N64 will look fine on S-Video, the Genesis and SMS look terrible on composite and really benefit in component. Then you'd have component, with a switchbox, available for modern systems like Gamecube (though that cable is expensive), PS2, X-Box, etc.