[pdub]

I'm looking to buy my wife an e-ink ereader that plays well with Calibre.
Important to me:
- great screen, 7" or thereabouts seems the right size
- good reading interface
- ideally simple to navigate and grab books from the calibre server
- light & rugged

Not important:
- touch screen
- color
- other games/apps

I've heard that the Onyx T68 is nice, but this would be my wife's device, so I'm not looking for something that is hackable and tweakable at the expense of being simple to use.

Thanks!