Mine is almost allways "Raven Gold, Raven-Gold, Raven_Gold" (depending if spaces and dashes are alowed) and is rarely taken, and if it is, I just add a 6 to the end or I take my alt, Greenmand, again it's rarely taken.
That's why when I registered on PSN and Xbox Live, I went with name that no one else thought of. noPINGSattached. I don't like the putting numbers after the nic, because that just means you aren't the original thing. An added bonus with noPINGSattached is that it uses the maximum characters so no one can be noPINGSattached22, noPINGSattached69, etc.