At least on Amazon in the US, the Nokia 770 is $100 cheaper than the N800. These are virtually identical for e-book reading, and the 770 even has some advantages (like the hard case and more accessible top keys). The N800 probably is worth the extra money if you expect to use its extra hardware or to make significant non-reading use of the device.
A used 770 might also be an option. These are very well made, and I would expect an average 2nd hand unit to look almost new.
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