I wish the page turn sensors worked for me as well as they do for Tony but even after several weeks of use I still have trouble positioning my thumbs correctly to get reliable page turns every time. Sometimes they work with a single press but more often I have to reposition my thumb and press multiple times. For me, it's easier to tap the screen just as I do on my PW.
As for cases, I really like the Omoton cases for both the PW and the Voyage. They're much less expensive than the official Amazon cases and they're attractive, lightweight and high-quality. Here's a link to the one I use with my PW:
http://smile.amazon.com/OMOTON-Paper...aperwhite+case