.Co has two values, a spanish word for Columbia and a vanity useless domain for some company that want's to look like they have a major domain, oh some type-ins come too if it's a major .com and the person has a sticking keyboard. Other than a token value for vanity use, it has very little value max low XXX
Now you can believe the .co hype, but in reality, the word has no seo value outside of Columbia, so only spanish keywords may have value for use in Columbia
It's another hyped country code that has a ton a worthless reg's or low value reg's in it
Other than protecting trademarks in Columbia and doing spanish keyword development, nothing but VANITY reg values
IMO