Hi, joyjoy61-
Much as I love mine, I have to recommend you take the PB360 off your list - it doesn't have touch screen capability. Though it's great for reading 'bout near any format...
Oh, and unless you read text only PDFs (which most e-readers can re-flow), most 5" and 6" readers don't do PDFs all that well. It's designed for, in the USA, consistency on 8"x10" paper. If you don't zoom in on them - they are way small to try to read. And, if you DO zoom in on them, they are hard to read (paging all over the place to read the file). So, there's a lot lost if you're trying to read PDFs with graphics, charts, tables, pictures, etc.
If you want PDF readers, I recommend you go with the Sony PRS-900 (on your list) or the Kindle DX (not a touch screen, though). I have neither, but I imagine they'd be better than the smaller e-readers.
Good luck with your search.
Marilyn
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