I would go for 2. and 3.
If the reader can do what I want (2.) and does it always correctly (3.) then I do not need to have another one; hence the price is not that much of an issue (within margins
)
So far the 800 seems to be great in 3. and for 2. there is some hope left for the zoom in pdfs and maybe even annotation (am I too optimistic?)
Anyway, for reading it is great - that's anyway the main purpose no?