Thanks!
Yes, most of the things I want to read are pdf's. And 3000MB are enough for that! (Even if not, I would not have to have my whole library with me all the time!)
That Flash of the small Sony reader was annoying, but if the dx turns pages fast, that could outweigh the negative side of looking into a light bulb all the time (LCD)!
PS:
Am I right? Or am I just manipulated by those people who say LCD's cause eye strain, e-readers do not more than paper books??? I mean, for some books color is really a must, and no e-reader can provide basic colors, at least. Still, I have many black and white pdf books, I have not read, because ink is so expensive to print out, and reading several hundred pages on a LCD...just not as "relaxed" as pure paper.