Tbh, mame roms are the problematic ones, for the console emulators just torrent search for NES/Snes etc roms and look for collections, you can use sites like http://www.doperoms.com/toproms.php?system=super%20nintendo%20snes to download individual roms to test but you want a collection with all the roms organised.
Tbh, mame roms are the problematic ones, for the console emulators just torrent search for NES/Snes etc roms and look for collections, you can use sites like http://www.doperoms.com/toproms.php?system=super%20nintendo%20snes to download individual roms to test but you want a collection with all the roms organised.
Use this site https://github.com/retropie/retropie-setup/wiki/Nintendo-Entertainment-System to go through emulators and find the recommended ones to choose, if you go for a Pi 3 you can run pretty much all of the console emulators without issue.
Oh and to add, you should get a Pi 3 even if you don't need the extra power, the fact that it has built in wifi makes transferring roms way easier.