I find 16:10 works well for vertical games. Not many horizonal games rendered @ original apect ratio will use up that space. A 16:10 monitor is going to be closer to 4:3 then a 16:9 but the difference will be negligible. Like you said you won't be able to make your screen auto rotate at that width. What you could do is make sure the screen is perfectly centered in the bezel and design the cab to make sure the bezel is perfectly square. If you place the monitor on a rotating stand. You can then simply unscrew the bezel, pull the monitor, rotate it, and stick it back in. Reinstall the bezel at 90 degrees (thats if you designed the outer demensions perfectly square) Now this isn't a good solution when you are changing games on the fly, but it makes it easy to change setup if you change your mind about horizonal/vertical games down the line.