CE, these are the games on the SNES Classic I've never played, which one first?

Well, Super Metroid is the best one for me, so that. Although, you could also save it for last. It's highly replayable, so you might even play it multiple times.

I think I've played even fewer of the SNES Classic games to be honest. I haven't played:

Mega Man X
Donkey Kong Country
Contra III
Secret of Mana
Super Ghouls and Ghosts
Super Mario Kart
F-Zero
Super Punch-Out!
Star Fox (and 2 obviously, not counting the "beta")
Both Kirbys

Of those, I'm most looking forward to MMX, Secret of Mana and Contra III, in that order.

I've played but haven't beaten:

Zelda: ALttP
EarthBound
Super Mario RPG
Super Castlevania IV

So, I have a lot of gaming to do. :)