All. One thing about buying a resold Kindle is that they are registered to your member ID at Amazon. Any books purchased from Amz and loaded to them are licensed to that particular Kindle. Careful to get that Kindle ownership license transferred to you.
Re book prices, once the books are out in paperback, generally the price changes to at or lower than paperback.
Also, all ebooks purchased from Amz are in your library at Amz as long as they remain in business. The are not shareable between Kindles. They can't be passed around like paper books can. However, you can always pass around the Kindle, I guess.
People are using 8gb and 16gb SD cards in their Kindles. I have an 8gb coming this week. I need to load it up to see if the Kindle will recognize the whole 8gb or only 4gb of it.
Transferring between Kindle and PC is easy. The Kindle automatically creates three directories on the SD card, and you are instructed into which directory to place music, audio books, etc.
Amz provides two .pdf manuals for the Kindle. I found downloading and reading them before purchase answered tons of questions and gave a pretty good idea of what it does. They manuals are very repetitious though, so it's not good bedtime reading.
--pat