Quoted from Brian541:
I got an old keno machine almost the same as yours,I think the way the cabinet/shelf sits keeping it a horizontal monitor mount makes more sense.A 19 to 22 inch lcd should squeeze in,Haven't measured yet though.I was thinking the 19 in 1 for mine.Smaller profile closer to a cabaret cab should be good for anyone tight on space!
I'm going to add a marquee, which will cut downon the real estate for a monitor. I was thinking 15 or 17 will work nicely. I'm going to gut it, so the current monitor layout isn't an issue.
There's nothing wrong with 60 in 1's imo. I have one in my basement and it's what got me into the hobby. It's got its issues, but for the casual enthusiast, it's great. Same with the 19 in 1, which i also have.