WELCOME TO MR!!!!!!!!!!!!!
I do not own a kindle 2 but to be honest with ya I think that they are all pretty good. I did a bit of research before I purchased mine and they all have their good points and bad points. I think the best place to start looking for more info on the kindle 2 would be here:
https://www.mobileread.com/forums/forumdisplay.php?f=140
after you check there go to the main display area here
https://www.mobileread.com/forums/
and check out some of the free ebooks and other forums regarding maintaining a library and format conversion.
once again welcome to the site.