A technical e-reader has to be able to read PDF's. Epub-only format shrinks the market for such a device even more. OP, you even noted you had PDF's to read.
It also needs to have a color display. Too many charts and diagrams look unintelligible in grayscale.
I'm not seeing why you resist the tablet, aside from price. Price will come down. Not only that but Apple's investment in high-resolution iPad screens will make them more common in other brands. Maybe Google's rumored tablet will be your huckleberry?
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