It depends on the storage availability and ease of conversion.
I used the Ebk1150 for a year and it had a hard limit of 128Mb with card and easy conversion both individual and bulk, so I would keep 80-100 or so books that I wanted to read/reread at the time.
When I moved to the 770 as my main reader and I have a 1Gb card I keep all my favorites and read books and add any new book of interest so I have easily 100+ books that I plan to read on it and hundreds read, all for about 7-800Mb memory so enough space for a while.
When I used the Sony for a while, I did not put a card so I used the internal memory only which was about 100 Mb also and put only new books to read - here the conversion seems a bit more cumbersome even with the superb Calibre, or just I all forgot about that after not needing conversions for my 770 for so long.
Now that I gave the Sony away, I still do some ebooks in lrf since I like to read in that format on my pc screen the best and with the new Sony 700 I may get one since it's getting closer to my needs
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