It's difficult to comment, because I don't know why you ruled out those choices. Some other choices use the same e-ink screen. Others use the same manufacturer, etc.
If you wanted to buy something now, and you didn't want those I would point you in one of three directions:
1) Astak (from Frys Electronics) their ezreader
2) iphone or ipod touch
3) Any used pda, palm or windows CE from ebay
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