Help find me a document/eBook reader with a big screen?

I'm not really looking for an eBook reader, since I mainly just read public-domain books or library books, and if I like a book, I buy a nice used copy. Instead I am looking for a document or page-reader. An eReader lite, at best, since a lot of my downloaded books are PDFs. I do intend to purchase or get some free ebooks later, however.

• I would like a small device with a decent sized screen to be able to see the text on, possibly being able to magnify it. Maybe a 10" screen or bigger?
  
• It should be lightweight.
  
• I want to be able to drag 'n drop, or use software to put my own PDFs or other file formats on the device.
  
• I would like it to support numerous file types.
  
• Color screen is not necessary, but would be nice.
  
• A speaker for audiobooks would be nice.
  
• It should support e-ink, and not use LCD backlighting, which strains eyes.
  
• I want to spend no more than $200, and even then, I'm probably buying used. Find it, then we'll worry about price, it all depends on the features. I don't want to paint myself into a corner here

Any other criteria, please let me know. Thank you all so much. Holding books gets so heavy for me any more