Have you looked at the enTourage Pocket eDGe? You can find one on Amazon for under $200 and it might fill all your needs. It has 2 screens: a 7" Android tablet and a 6" e-ink reader. The e-ink side has a journal function and uses a wacom penabled stylus for input.
Videos here if you're interested:
http://www.youtube.com/view_play_lis...33F2B46141B52A
And you can read what forum members here on MobileRead and at the enTourage website have to say:
https://www.mobileread.com/forums/for...lay.php?f=218; http://www.entourageedge.com/forums/forum.php
Good luck! Enjoy!!