while you mention the A500, wich is ocs only, and cannot run ecs games,so the A600 is more classic-gaming-ready 
I have never encountered a game that do not work on A500, except for AGA games though... And that was before i got the 500+, my old A500 was a A500 kick 1.2 0,5/0,5 MBram.
And it played ALL the games i ever tried on it (-AGA)...
I shoot muself in the foot... I have become very unsertain about what was rare... ECS games i guess is the rare ones...
I have kick 2.04 in my 500+, and i have not found the OCS possability...
I am confused. Until a year ago it was 10 years since last i used any amiga.... And i started back up again with the A1200, exactly where i left it...