I answered some of your questions in the "Introduce yourself " thread.
The Opus is a 5 inch reader, where Amazon's Kindle is a 6 Inch reader. 6 inch is probably the most used size, but there some really hardcore 5 inch fans. I have an Cybook Gen3, which is 6 inch and does the same as the opus. You can only use a dictionary on Cybook readers if you install the mobi firmware, and then you can't read epub. If you go for a Pocketbook, you can install what you can find of free dictionaries, but it takes some work finding out how to.
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