The problem is that virtually all other devices use ePub, not Mobipocket, so if you get something other than a Kindle, you'll have to convert all your books from Mobi to ePub. That can certainly be done, but for a large number of books it's a fair amount of work.
If you do want an ePub device, I'd suggest something like the Sony PRS-T1. It meets all your requirements. But I'd honestly suggest that you reconsider your decision to move away from the Kindle.
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