Navigation or Meta Navigation

I am redesigning the core navigation of a brand site. We are now including a "Community" section, which will be hosted in a subdomain like "community.brandname.com".

It's quite an important section of our platform, but still a subdomain. I am wondering whether it makes more sense to add this link to the first level nav in our header or in the meta navigation - smaller nav elements just above.

Any best practices on that?

Thanks!!