I played a Star Wars conversion (not sure what it used to be) and it had a raster monitor (likely std res).  It was blech.
And regarding monitor size, I just can't play anything that isn't at least 19" viewable....although, what really confuses me is the lot of you who were, say, like I was, between 7 and 13 and want it to be authentic.  To me, authentic means it's the same size as when I was that age.  You'll notice original cabs were made for shorter, smaller people - hence, a cab now MUST be larger.  And so if the monitor ain't at least 25", it ain't big enough.  Anything else is just settling.