I can start answering some of your questions.
Yes - the Warehouse Deals refurbished models carry the same return policy/customer service coverage as a new DX. Generally, people have given good reports of the quality of the refurbished units.
There are rumors abounding as to whether the DXG or earlier DX models will get a firmware upgrade to handle PDF's comparable to the K3 functionality. No firm answer that I am aware of.
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