Hi, I don't own a PW or a glo, just a Kindle 3, PRS-950, PRS-T1, and Onyx M92, so I can't give many details on the PW. I NEVER use my Kindle 3 for PDFs, and I use my PRS-950 for simpler PDFs when I want a small form factor device, and my Onyx M92 when form factor is not a constraint.
You can read about the PW here:
General review:
http://www.the-ebook-reader.com/kindle-paperwhite.html
PDF review:
http://blog.the-ebook-reader.com/201...-review-video/
Another review:
http://goodereader.com/blog/electron...le-paperwhite/
You can ask PW owners in this subforum here:
https://www.mobileread.com/forums/forumdisplay.php?f=140
If you are prepared to read PDFs in landscape mode, then perhaps the PW will be usable for *most* PDFs. But you had better ask some PW owners how well that works, and even if you get decent answers, please realize that PDFs viewed on 6-7 inch screens are always something of a compromise, with the PW coming in the middle of the pack in PDF usability as far as I know (the older Sony PRS-950 being the best, though it is discontinued, and can only be purchased used from eBay).
I know this runs counter to your constraints, but I still think that the Onyx M92 would be the best if PDF support is of paramount importance, especially if there are many charts and/or graphs.