i don't think you are going to be able to connect consoles to a PC monitor without some kind of converter.
A Scart TV is good option if you were in Europe as long as it supports the RGB inputs (not all scart TV's do).
I have gone for Hantarex 21" MTC EQ/2E which is a video monitor (a TV without a tuner but it has Scart, s-video, and RGB inputs. I have an ArcadeVGA graphics card connecting to the RGB inputs on the Scart connector. I am getting an authentic std res arcade monitor effect but also have ability to connect a console as well. The only downside is that the EQ/2 is pretty large unit and fairly deep so it will be a pain to fit everything into my cocktail cab
