I've never had a 5'' ereader, but as far as I can see, their main strength is portability while still having a resonably large screen compared to a smart phone.
It does sound as if you should buy yourself another Sony. If you want a dictionary (I think that's great myself), you have the choice between Sony 600, the Kindle and the JetBook (apart from the DR of course). With the Kindle you can even use a translation dictionary (with a little fiddling for non-English input languages) - also for the JetBook BTW.
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