When I made this thread I knew very little about e-readers. Having purchased two and done a lot of reading (none of which I paid for

) I can say that every reader you can find will read PDFs. But some have better re-sizing software than others, so it's not always as simple as copying a pdf onto the e-reader if you want good font size, etc.
It doesn't really matter what brand you buy because there is an excellent open-source (Linux/Mac/Pc) program called
Calibre for converting to or from any e-book formats. The standard is epub but the Kindle/Amazon uses it's own format (.mobi) which is annoying but not that bad. Libraries now have ebooks and they are usually epub format.
If I were you I would just get the cheapest reader, the Kobo and the 6" $80 Kindle looks great. Keyboards and touch pads add bulk & cost and you will never use them after the first day. Also the whole point of an ebook reader versus a tablet or computer screen is to not hurt your eyes. If you get a color tablet - that's great for comic books or browsing the web but it is not fit for reading a novel on, unless you want a headache or vision problems. It's also a source of heat and electromagnetic radiation. An e-ink (black & white) reader is like a calculator, so it feels 'dead' like a real book.