Hi, cfrock. The new Sony readers have the e-ink pearl screen, excellent battery life and read EPUB files so you wouldn't have to convert your library to MOBI files. You might want to evaluate the Sony models as another option.
On the other hand, I have not had any issues with conversions from EPUB to MOBI to use on my Kindle. I then use calibre to transfer my books to my K3. It is very easy to use, and there is a whole section of MobileRead dedicated to calibre so there are lots of people to help you if you run into problems. I also like that the Kindle has an email address, and I can email files to it.
If you are used to the Nook integrated wireless bookstore experience, then Kindle might be a better option. The 5" and 6" Sony readers don't have wireless requiring books to be sideloaded via USB cable. The 7" Sony PRS-950 has both Wi-fi and 3G.
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