As you can see from my list of devices, I'm an Amazon lover
My Fire is my goto ereader for nearly all my reading needs, but the K3 is the second most used and I'll be hanging on to it until it dies.
Re: Physical page turn buttons and keyboards - I picked up a little inexpensive conductive stylus and find that it's easier to use than buttons and the Fire keyboard is as easy to use as the K3's.