I can say: first thing, do you use images/graphics a lot in what you read? If the answer is yes, maybe it's a + point for the new iriver. I find reading on the Opus (whose levels of grey are a lot less than 16) sometimes better than on other devices. One partial solution would be try the iRiver (if it gets on WHSmiths shops), and see if it's comfortable.
The wifi can be a nice thing, but it's not crucial if the screen isn't a touch screen.
The crux is: what are you going to read there?
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