Unless you are an app, or a country/language-specific service/site, I'd still recommend using .com over anything else.
That said, there is a group of firm believers who seem to feel that .co domains are getting a little extra SEO love for some reason…
Still, given the recent potential for problems with ".ly" domains now that Libya is experiencing non-technical issues that may lead to routing/DNS outages for the whole TLD… It might be wise to make sure Montenegro and Colombia aren't having any political issues before committing long-term.
deano.com 