[qohen]

A friend tells me that for PDFs, the way to go is a Nook Color, which can be rooted to run Android, which has a good PDF reader. New it's $250 (which is what he has), refurbs are available for $180 from Barnes & Noble:

http://www.barnesandnoble.com/u/certified-pre-owned-nookcolo...

[cema]

Or, if you want an eink reader, you could get a PocketBook (probably model 902 or 903; see http://www.pocketbook-int.com). From the site:

  formats: PDF, RTF, FB2, Docx, TXT, 
  HTML, DJVU, CHM, PRC, EPUB, DOC, TCR, 
  including DRM .epub

I have just bought it, so far pdf looks good on it. Of course, it has only been a few days.