To e-reader and sony experts: i have a 505 that I've used for the past few years. Basically, I'm pretty happy with it. Are any of the newer models a significant upgrade? 950? 650?
Wi-fi is not that important to me. Touchscreen might be nice. What would really be a plus for me would be more clarity of the text (not that the 505 is bad) and a bigger screen.
Have things progressed that much in the last 2-3 years that upgrading is worth it?