I'll admit, I love the look of the Sony Readers but I used to have one and I just didn't get on with the touch screen even though I love the touch screen on my iphone. What suits me though won't necessarily suit someone else.
I fell in love with the Kindle from version 2 international - even though I did think it was ugly to look at! It scrubbed up quite nicely in my black tuff-luv flip cover. I think it is mainly because I love how it syncs up so easily with other Kindle apps and the ease of buying books and downloading them in seconds. The whole set-up is super easy.
By the way, if you store all your DRM-free mobi books in dropbox, you can access your dropbox account via your Kindle and clicking on a mobi file will download it onto your kindle rightaway. No messing with emailing - it's instant and all done via the Kindle.
See
http://www.kinworm.com/2010/10/backu...g-dropbox.html
And
http://www.kinworm.com/2010/10/downl...s-to-your.html
Enjoy