I'd also read this thread in MilesBuzz, which summarizes a good deal of information regarding status matches among a variety of airlines.

Given that your status is with CO, your best chances for a status match are with non-Star Alliance airlines.

Alternatively, you might consider using flights on other *A airlines to maintain or even improve your CO status. This has some drawbacks, since airlines tend to treat their own elites a bit better than partner elites, but might work out depending on the specific benefits you're after.