Unless you particularly don't want a touch screen model, you probably shouldn't rule them out. I think most people are like meeera in that they can fairly comfortably use the touch screens to turn pages while holding their e-reader with one hand. If you can hold your PRS-505 in one hand and touch the screen with your thumb, then you'll be able to do it with the slightly smaller and lighter e-readers that are available now.
I don't really need a light either but the newer e-readers with in-built light have a better screen resolution, and it's not like the light makes a huge difference to the battery life. The main reason I've yet to upgrade is that I personally really like my Kindle with the side page turn buttons. I also have a PRS-350 and rarely use the touch screen on it, I prefer the buttons, but don't like the placement at the bottom the same as the side buttons on the Kindle.
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