Ack! I forgot to ask earlier...
According the wiki matrix, the Sony has 8 levels of grayscale, and the Cybook 4.
Assuming this is accurate, is there a noticeable difference between the two? As a side note, the greater resolution of my VGA pda has ruined me for the QVGA models. I know that this isn't a resolution issue, per se, but a 'how-well-does-it-shade' issue. However, if text is much sharper on the Sony, that may make all the difference, font issues aside.
Ok, thanks - now I'll let some responses come back before posting new questions
. Thanks for all your patience!