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I'm keeping my O51, kurt's tag.read the books.
I think the three-lettered\numbered ones we have now are kinda cool. Can do some nifty stuff. Example: R35 or Z06. That said, I'll be changing mine to 0D1N. Been debating using one from the book, but eh.. doesn't seem very original.[Edited on 06.02.2009 2:30 AM PDT]