If you wanted to use your German address/identity what you would do is register the Kindle at Amazon.com and then list your German address in the section in the Manage My Kindle webpage.
I'm not sure where you would have the best price selection.
If you wanted to use your UK address you'd probably be better off registering the Kindle at Amazon.co.uk and paying in British money. But you could register it at Amazon.com and put the British address under the Manage Your Kindle section. Then you'd get UK availability and prices but pay in American Dollars.
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