PS -
Don't get too worried about Large storage capacity. Ebooks don't take up a lot of room. On my ebookwise, I have only 64mb of storage - and 180 books - that's enough for a week or two of business travel. In practical terms, the more books and stuff you cram onto your reader, the more difficult and time consuming it can be to find it and access it. Since you say you will be using your computer more than cloud-computing for accessing ebooks - you should be okay even with a \PRS 300. Also, for a used 505, the main issue that |I have seen go wrong is a screen freeze (and you can always see that) and that the battery doesn't hold a charge (known issue for all li-on batteries). depending upon the price you might be okay with a used on - though the 505s are going for a price equal to or higher than the 600s
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