I'm going to go ahead and add these scores (1 & 2) as they are indeed the two best ever.  And I'll also add my MAME score as it's a tad bit higher than my arcade score.  I'm also going to add another two arcade scores as they may be needed for now until they are topped.  Some may be missing since I don't have the TG database to look at and ChamPOW is missing scores.
I guess we are going with the highest score a person has made between arcade and MAME.
1) Tom Votava 4,678,440  Arcade (a score that very well may never be beat)
2) Perry Rodgers 3,481,550  Arcade ( Legendary score from back in the day that I respect very much)
3) Stephen Boyer  2,285,280   MAME      
http://replay.marpirc.net/inp/b/4/a/rip_marioo_2285280_wolf106.zip 4)  Mauro Ruozi   1,376,000   Arcade
5)  Spencer Oueren  1,202,210  Arcade