MAGFest is a great con, but as someone who has been going for many years now I would say it's no longer top tier for collectors. There are usually only 2-4 booths for retro games and they are mobbed within a few hours of the vendor hall opening. That said, it's an amazing con for retro gamers with the arcade, the console hall, events, etc. I would say go to play games, not to find your grail