I use the M-edge Leisure cover on my 505 to read in the bath.
I've also used it for the 600 and it worked fine with the touch screen.
It's not waterproof, but it is water-resistant. It's also a nice texture for holding with wet hands, so you're less likely to drop it.
The plastic is raised off the screen, but I don't know how it would interact with the 650's IR touch screen.
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