Playing ATARI2600 or some consoles in a cab? C'mon. Just go on eBay and search for an old 14'' (or more) CRT TV and build a decent setup. Those machines *were not* designed to be played in cabinets. And at least you'll be able to connect the keyboard and enjoy computers as well.
Though I understand that the future is seeing kids play pacman on their smartphones and move it with their fingers (when MAME will have touchscreen support).
This is not meant to be a reply to someone in particular, but a general hint. Then, it's a only a matter of personal choices.