Hi, i am using
Sony Ericsson k790i from the past 9 Months.
* It has great still photography features but bad video quality(--->As compared to
Nokia N72 2Mp cam)]
*Sound Quality is Good with a 5 band Equalizer...but no Megabass.
*But its got a great speed as compared to other Symbian Smart phones as it is based on Java Operating System.
*You can directly read A complete webpage (.html) saved. Just copy entire links and folders into your phone and navigate from the start link

*I dont have any idea about book reader.....but you can directly read .txt messages.
*You can also edit .txt messages using
MobiExplorer v3.
*Huh..one more thing...the speaker is sound is Descent but great on earpieces.
*Battery life is good as you mentioned.
*I have not tested on higher mem cards...so no idea