like you said, lower res games look very blocky on a computer monitor. The more simple the graphics , like pac man, the more you notice it. Games like MKII I don't tend to really notice. Personally I don't like any of the various scan lines and such that are supposed to make it look like an arcade monitor. Sounds like you would be better of with an arcade CGA monitor than a computer monitor.
Of course everything is a tight fit but it does all fit. Maybe a couple inches to spare between the coin mechs and the monitor chassis as well as the coin box. You will need to set the coin door as close to the bottom as you can. It does, however, provide more real estate for mounting the computer components, ipac, optipac, etc becaus it is a larger cabinet.
Let me know if you need a metal 3rd control panel...I still have 4 left I am selling at cost. (Exactly like the one I used, blank so you can set up controls the way you want)
I have not heard of anyone getting a refurb d9200 but the people i have seen get a refurb u3100 have had good luck. Sometimes refurb just means an un-used buy back that they technically can't label as new. Don't rule out the Kortek either. Kevin Steele at retroblast seems to prefer it and I believe they are on sale right now.