One minor point I'd raise with the .co is a while ago I read (on HN I think) that one a particular startup had a lot of feedback from users saying "you're missing an 'm' in your logo/url". It might confuse some people that aren't familiar with how ccTLD/gTLD's work.

If you've come across this before, forgive the pestering, I just thought it was fair to point out before you've launched.