Thanks alot for all the valuable feedback, I really appreciate it.
It seems to me from hearing you that the page turn on all newer devices are comparable. And the biggest difference between the Sony and Kindle DX is screen size, touch capability and format. I have around 722 books (Thank you Baen) in Mobi so far, but with Calibre I don't think conversion will be an issue.
Seeing as the best reading experience is my main priority, I think I'll go with the Kindle DX as it'll give me a better and bigger screen with faster page turns, without the drawbacks I invisioned of clunky button placement and slow page turns.
Thanks alot for helping me out community

(If anyone has upgraded from a 2nd gen device like my Cybook to either the Kindle DX or Sony Touch, I'd still really like to hear from them about the experience).