Anyway, it would be GREAT if there was a Wiki started that had the EXACT resolution that a game needed to be set to for the AVGA card. Or perhaps MAWS could have this feature added?
Several problems with this:
1) There are different versions of AVGA with different available modes.
2) There are many different screens (ie some might support modes other do not).
3) People's screens are adjusted differently (ie some will display more lines than others).
4) Opinions often differ on which is the 'best' mode.
5) Someone would have to manually make a choice for each new game, each new Mame version.
So I would say there is no point even attempting this.
Edit: I forgot:
6) Different monitor orientations (h / v / rotating).