I think a Nintendo 64 Classic Edition would be pretty cool. It could have some of the classic N64 games like Super Mario 64, Donkey Kong 64, Mario Kart 64, Perfect Dark, and GoldenEye 007, as well as not so popular but still great games such as Jet Force Gemini, Mischief Makers, and Wave Race 64.
Also, rather than a PS2 Classic that would be a follow-up to the PlayStation Classic, I think a better alternative would be a follow-up mini console to the Genesis/Mega Drive Mini, which would most likely be a Saturn Mini. Since the Saturn was made by Sega back in the 90s, I think that the Saturn Mini would have more iconic games that more people would be interested in playing today, especially smash-hits released for the Saturn and developed by Sega such as Daytona USA, Sega Rally Championship, Panzer Dragoon, Virtua Fighter, The House of the Dead games, and Sonic R.