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The only 'color' eInk devices out there are the Jetbook Color 2 (9.68") and a newly announced model from Pocketbook (8", frontlit). Both use eInk Triton which isn't all that great for color.
For grayscale there used to be a 10.2" reader, the Irex DR1000, but the company went bankrupt a few years ago. 9.7" is the next largest out there and for that you have models from Onyx and Pocketbook (or a used Kindle DX).
If your textbooks are mostly PDF you'd likely be most happy with a tablet of some sort, even if it's a model a year or two old to keep costs down.
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