Duodora, I've got the 505 and like it a lot. I've traveled with it a bit and it is very handy on the road. I get about three plus weeks per charge. Were I to switch off the device completely rather than let it sleep, I expect I'd get more time. I recommend you get the optional charger as that pumps up the battery faster than the USB charger and won't take up much space in your bag.
I get by fine with the Sony book site supplemented with Fictionwise who now sell Sony .lrf formatted books.
Truth is, I don't think you'll go wrong with any of the choices.
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