The device closest to your needs has been announced for 1H09 (June?) release by Plastic Locic, see the
wiki (or search the forums).
Of current devices, the DR1000S is closest (DR1000SW with wifi announced but not released yet). It does not support .doc or .docx, and being Linux based this may not be easy to add. However, iRex has released a SDK for the device and is supporting 3rd party development. So if you know of a Linux DOC reader application, bring it up in the DR1000 forum.