Just got a new sony prs-300. Good enough to do what I want, just read books!. I've found Calibre very useful, because I have a lot of books in MS doc and pdf format, that can be read but ocuppy a lot of space and slow down the device. Since now I was converting the books to LRF, but I've read in the user manual that EPUB is better for Sony's readers, so I will use it from now on.
Regards to all and I'll try to stay in tune...