I'm thinking along the same lines, and my current solution is PocketBook 903 Pro.
Reasons: Hi res display, memory card slot, built-in DJVU support.
Kindle DX G may have the pearl, but unhacked it's djvu support is limited and it has no memory card slot. It's more of a "buy and read DRM books" platform than "read djvu/old scanned math papers and annotate them with pen" like PocketBook.
But the true math reader/annotator platform does not yet exist.
It needs to have a bigger display (11-13"), higher resolution, support for HTML5/MathML, etc.
Maybe in 3 years time as tablets progress.
eReaders are mainly targeted at main-stream basic fiction book reading (with little illustrations, no obscure formats and definitely no math mark-up).
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