I just joined the forum. So far, I love it!
I haven't made the move to an "e-book device"

just yet. However, I once read a chapter of a book on a Sony PRS-505 (I think) and enjoyed the experience. An ever-increasing number of my patrons/customers are using them and I'm about ready to buy one.
Based on what I've read, I'm leaning towards the PRS-900. The library finder functionality is especially appealing. However, I have some questions about it. I need to find one in a store and play around with a bit for a while. It's a bit expensive too. Ah well, I'll make up my mind someday.