Can't speak to the Linux question (although I'd love to find out what works with Linux - I'll be watching replies for that!) but I have a Sony PRS-600 (red). I find it very readable, although there's some debate about glare resulting from the touch-screen. It bothers some people more than others. It does, however, have an SD card slot. Mine has over 200 books on it, and still has plenty of space available, too (and the SD card if all else fails - I can't see needing it for my uses, to be honest).
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