I just started this very project. I grabbed some 1.5" binders from Staples (Better Binders are quite nice) which can hold about 100 card sheets (1800 cards) each. So i have:
Gens 1-2 in the first binder
Gen 3, 4, 5, 6 in their own binders
And Gens 7-9 split into two binders
I've done the math...