What is the benefit of going back to un-root?
If you really want to go back to stock and retain rooted state, you can just use cwm, do a rom-wipe, then wipe data, wipe cache, wipe dalvik, and then download the back-to-stock-rom.zip from xda, and then flash that, then do another wipe data/cache/dalvik and then you are all set, back to stock, still rooted. I don't think anyone can tell you are still rooted.
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