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You will be able to re-download any purchased books on your new Kindle once you have set it up and connected. Yes, the Paperwhite is usable in the dark (it has integral backlighting) so you can use it without any external lighting devices.
You can purchase a kindle Paperwhite Here: http://www.amazon.com/dp/B00JG8GOWU/
If this has answered your question, please click on a smiley face before you go. If you need additional help with this subject, please type in the chat box below and hit the reply button and I will reconnect and assist you further.