Mike, thanks so much for the advice -- it's very useful to me, as I'm building my first MAME system.
One thing isn't quite clear to me:
I wanted to play some vertical games, but the cabinet I'm considering (made by slikstik) is a horizontal setup. I'm gonna use D9400, but how would it help me play vertical games? Or do you simply mean that the reduced area (after vertical aspect ratio is applied) is still good enough, due to the monitor's large size?
Also, what are those black lines that you are referring to?
Thanks!