The books you've purchased are yours. Yo can deregister and register up 6 different kindles (some ebooks are more restrictives and allow less).
That is, if you deregister your old one and register your new (or maintain both) you will be available your ebooks.
It happened to me: First I purchase a Kindle 2 and had some ebooks. Then I purchase a DX and automatically I had my old ebooks available to the new device.
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