Ebook Readers

[John Graddy]

I am considering getting an ebook reader.  I have noticed that nearly
all of them advertise themselves as being "compatible with PC and Mac".
The software that I have found for downloading public domain books is
also "PC version" and "Mac Version".  

Does anyone download books to an Ubuntu system and then load them onto
an ebook reader?  Is any particular ebook reader reccommended?  I would
hate to fork over more than $200 for one and then find out that I
couldn't use it.

Thanks,
John