300 dpi is overkill. 300dpi would be necessary if each pixel was only black or white, but with 16 shades of grey, 160dpi is plenty. It's even good enough with 4 shades of grey. I go for increased range of shades or colours before going for increased dpi.
My ideal:
Hardware:
10 cm x 16 cm screen (640x1024 at 160 dpi)
4-bit grey (16 levels) or 4-bit colour (4096 colours)
device no more than 11 cm x 17 cm x 1 cm
weight no more than 200g
robust screen - no glass to shatter
fast page turn, no more than 0.1s
no card slot, but at least 4GB storage
micro-USB data/charger connection
easy to use buttons for page forward/back
touchscreen
automatic portrait/ landscape, with manual override
Sony-style power management - auto hibernation with instant on
No Wifi
No Bluetooth
No headphones
Two weeks power on one charge, including 10,000 page turns
Software:
Mobipocket and ePUB support
User supplied fonts
User choice of alignment, font, font size
Large range of base font sizes - 72pt down to 4 pt
Computer based library/sync software (Calibre-like)
read/unread/position in book tracking
quick sort/search of library on device
quick bookmarking/annotation/dictionary lookup
on-screen keyboard
£99/$150
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