Currently my singular binder contains my primary (Magnemite), secondary (Magneton/Magnezone/Beldum/Metang/Metagross) and tertiary (Pyukumuku, whatever cheap cards I felt like picking up at the card shop) collections. With the expansion of my Magnemite goals, I’ve found I’m starting to run out of space so I’m looking for recommendations for a 12 card page binder, particularly ones with 600+ slots (which may be a tall order).
Bonus question for all language species collectors: how do you organize your binder/s? Currently I’m doing by set release date, then English, then Japanese but when I move to a bigger binder I’m leaning toward by art release date (so Base, Base set 2, Legendary Collection, Evolutions all together, etc) and then languages sorted in whatever arbitrary order I decide. I suppose that means a lot of pain for me if they ever do another base set reprint again 
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16 pocket binder, holds 1,024 cards. Made by top deck. I have an extra one if you need one, slightly used