The Jetbook looks pretty good to me... The iPad is a nice point of reference, but no real alternative to the two eink devices, as far as reading is concerned.
Thanks for the comparison. Maybe some information about the camera and the setting (background light etc.) would be good to know. Unfortunately, those pictures won't ever reflect real life experience with those screen technologies, even with extremely expensive equipment (camera etc.). But it's a good starting point for somebody, who doesn't have immediate access to those devices.