I'm with Jiiri. I don't mind the Kindle's case. In fact, just from a cursory glance, I like the Kindle case better than these new cases. I read with my Kindle in it's case all of the time without any problem. I just loop the elastic binding over the bottom right hand corner and the Kindle seems to stay put for me. I'd consider a new case if it was along similar lines of the Kindle, but even more book like:
https://www.mobileread.com/forums/showthread.php?t=17437