m-edge offers the e-luminator light which is designed to fit into their covers. I have a PRS-900 with an m-edge case and light. I don't know what the light does when I leave it on -- I never have!
I will be surprised if the m-edge case and light designed for the PRS-900 does not also fit the PRS-950 (which I think is an excellent choice for you, Gwen!

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Here's a link to m-edge. You might check that the dimensions they have for the PRS-900 are the same as for the PRS-950.
http://www.medgestore.com/products/sony/
My case is pink, and although it adds to the weight of the reader, I love how well it works and how cheerful it looks!
P.S. My husband has a Kindle and we do manage to share/transfer books. (See elsewhere for how to.)