Just putting this out there...
My Videotron bartop (see link in sig) uses a 19" non-widescreen monitor. For me and my kids it's perfect, although I admit I shouldn't really call it a bartop. Perhaps we should coin a new name for this type of cab? "Portacab" ? ;-)
I have managed fit controls for 2 players on there including spinners and a trackball, and it doesn't look or feel cramped. It's also small enough to be moved by one person. A small screened bartop isn't good for 2 players, not enough room.
I've ended up with a small-ish 2-player arcade cab that is portable. It's already been taken to a few friends houses, work's arcade night, and been in various rooms in my house.