I think you probably should reconsider your criteria. You won't come even close. Why not just get something and try it out and see if you like it? There aren't really any bad choices among the major brands so you can't go far wrong.
By the way, unless you get a very large screen ereader, which are expensive and are less likely to fit your criteria, you'll find them unsuitable for PDF reading in most cases. Nearly all ereaders will read PDF but the text in most PDF's can't flow and so needs a large screen.
I personally prefer Kindles. I do have Kobos and Nooks as well. They're all excellent. For your first ereader I'd pick one of them if you're in the USA. If you're in another part of the world I'd consider what devices you can get support for in your area.
Barry
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