Everest.
You made a ginormous, epic Mountain Sized Mistake!!!!!!!
Actually, no.
I walk past Skylanders I don't have with alarming frequency.
I like variants myself because it gives me a established difference with the character when I explore the second upgrade path.
But we have gone over this before....everyone has a myriad of subtle reasons why their collection is complete or incomplete, finished or work'in on it! If you like the character and you can afford it...yes, pick him up and name him Nagini! If musical snakes are not your bag..pass him up, no worries.
Will he be available later..? Not always but most of the time it seems you can run across them again. Hey, I eventually got Granit Crusher! if that can happen...the skies the limit!! or so says a bird friend of mine!