Practically all of the major ebook readers are switching from MOBI to mobile Adobe Digital Editions. The single exception is the Kindle, and even the Kindle DX is using ADE for PDFs. This is the same ePub/PDF technology as in the Sony PRS-505 and 700. What this means for PDFs is that they will all work about the same. There could be differences though, since the PRS-700 has zoom as well as reflow but the PRS-505 only has reflow. Also the standard view could be margin-cropped (the Kindle DX does this using mobile ADE) or full page (like the Sony's).
The Foxit eSlick is another exception. They are using their own PDF viewer. However, they won't be supporting Adobe ePubs.
Note that Sony is almost certainly about the introduce one or more new devices. The only real question is when (August to October). So you might want to wait a while before deciding. In addition to the Cybook, another option worth considering with ADE (soon) is the Astak EZ Reader, which is the US brand for the Hanlin V3.
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