Lets see, 6 years should be doable... but you have to be careful with it. A good bet might be the outgoing Sony PRS300. It should let you do most everything you want it to (well except buy books from Amazon), but its metal case and slightly smaller screen hopefully will make it more durable. The only negative from a longevity stand point is that the battery is not easily replaceable.
Just my thought on the matter.
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