For under $200 you should seriously consider a Pocket 360 Plus. It is "only" a 5" display but you really wont miss that inch. Many of the owners of the 360 have taken to calling the device "Mighty Mouse" for its outstanding abilities.
My 6 year old has been using our 360s for over a year now for short reading and a bit of checkers and chess. Its very durable.
take a look in the PocketBook forums for some user/owner insight.
https://www.mobileread.com/forums/forumdisplay.php?f=206