To be honest I don't really like any of them. #2 has the best keywords, but .CC is way down the totem poll of extensions. Personally, I would rather not build a site that wasn't one of the Big 3 (COM/NET/ORG). Those are the only extensions that 95% of computer users have heard of, and therefore the only ones they trust.
#3 is too long for the "I" prefix. It is normally better off followed by 1 word, or 2 shorter words.