i might note that after loading nearly 3000 books onto a 32gb oasis 2 with a very high percentage of those being large books such as music and science and technical and reference books, it only took approximately 5gb of space. i post this for those not knowing whether they need the 32 gb models and turns out that unless i add double what i have, i wasted the $30 each i spent on the oasis and the new pw model. but i remember trying to load the calibre library onto a 4gb kindle and failing, so i guess i over-compensated.
i might note that i don't have any magazines or comic books or graphic novels or audible books, any category of which could easily change the equation.
/guy