[Innit]

Hey
For almost two year now, I've been a student of political sciences. So, I have to read a lot of journal articles, more and more each semester. I don't mind sitting on my sofa or lying in bed and reading some, but this doesn't work with a laptop (sore eyes and too big) and I think it's a total waste to print all that paper (it results in a big mess which is hard to store). So, an E-reader seemed like an awesome solution. A pretty extensive internetsearch(and some testing with e-readers from friends and family) was quite disappointing.. journal articles are mostly in pdf, and most e-reader don't (decently) support pdf. It requires a lot of converting (which also means that tables and so on get lost in translation) and is thus not practical. Since studying is more than reading alone, I need to be able to highlight and make notes. Little options remained, but the onyx boox m90 and m92. The m90 is cheaper, so this would be my first choice (especially since it's already way too expensive for me).
That's the story so far. I do however have a few questions that I really hope you guys can answer.
1) As far as I know, you have two types of pdf. In one, the text is actually readable as text and the other is basicly a picture of text. I know that you can annotate and highlight in the first type, but can you also highlight in the second type? Does this need converting to text? (the onyx boox can do this by itself, right?) and if so: do I lose my layout and thus my tables? Anyone any thoughts on how this works?
2) Does the highlighting work well in general? And is it saved properly(exportable?)? And how about the annotation?
3) Is the difference between the m90 and the m92 really big? Should I consider buying the m92? (while answering this, do realize that the m90 is actually already way over budget for me.)
Sorry for the long post, but I could really use your help! Thanks.
Oh and btw, I'm new here.. So I'm sorry if I'm asking stuff that's already been asked, I did have a good look around, but didn't see it.