Originally Posted by kazuma6666
I don't want any "closed" reader (kindle for example).
Where do people get this strange idea from that the Kindle is somehow "closed"? It's no more "closed" than any other reading device. You can seamlessly convert any ePub book to the Kindle's "KF8" format using Calibre, and read it on the Kindle. The Kindle has (probably) the best dictionary support around. Not only does it come with excellent dictionaries, but you can buy an install hundreds of additional commercial dictionaries from the Kindle Store.
The Sony also has excellent dictionaries, but you can't install additional ones.
The Odyssey's dictionary support (other than French) appears to be extremey poor.