Ahhhm, by Sony Professional Video Monitors, I am not talking about the VGA monitors but the Broadcast monitors that they used in TV studios and professional AV places (in the industry they were often called "cubes", as they are built into a sturdy metal frame and stack easily). They accept a wide range of cga and ega inputs (eg all of the ArcadeVGA card modes, including the problematic 400x256x53khz one), and will even show vga modes in a split-screen format (the vga split-screen is not good for gaming, but OK for troubleshooting).
They have a 27" screen, model no. PVM 2730QM
They are theoretically able to display 600 vertical lines, which means that 800x600 looks OK for windows and other games. Most CRTs can't really do 800x600 very well. When my friends see it , they usually say something like "Wow, that's clear" or "Those colours are bright/good". They are also incredibly durable/sturdy, and have steel/magnetic shielding around the entire monitor back. They accept a wide range of video/RGB inputs inc SCART AND outputs. This means that you could, for example, output the video/games/DVD to your TV in addition to having it run on the monitor.
They also have a built in quality sound amp, which is powerful enough to drive 8-16 Ohm external hifi speakers. So no need to worry about the amplifier for you cabinet.
I've managed to pick up about 6 of these cheaply and opportunistically, as they are now considered obsolete (there are newer 29" CRT video monitors around now) and some local studios have gotten rid of them. However, they still fetch around $400+ on the market as many people know them and their quality. I've recently decased one and popped it into a large upright cabinet I found at the recycling centre(!), and it runs very sweetly indeed. And as the inputs (and screen adjustments) are still accessible via a little door at the back, it can still be used as a Professional Video Monitor in addition to Arcade Games, jukebox and movies etc.
I'm a very happy little arcade junkie.