I am currently running my EMUs through my 36" Widescreen HDTV and i was wondering what type of res looks good for EMUs?  I am using s-video.  When i orginally plugged in, the res for the video card was outputting 1024x768, but that is way too tiny a font to read on the TV.  I downed to 800x600 and that is ok (thinking of changing the MameWah Font Size).  Although with Mame.ini resolution = auto some games don't play (specifically older vertial games, they are only half on the screen).  By setting the games to a specific res of 640x480 the games correct themselves.  Should i run everything at 640x480?  Will this make newer games like Motral Kombat and Marvel Vs Capcom look like crap?  Or should i just manually edit ini files for certain games?
Thanks for the help.