MacOS – What’s a good Windows RDP client for Mac

I administer a number of Windows machines, and am trying to find a really good application to remote desktop in to them from my Mac. I've tried CoRD, and I really like its library approach to saved sessions (as opposed to Microsoft's file based approach), and tabbed sessions are great when working on a bunch of machines. Unfortunately, it's just too buggy for serious use, and given that it averages less than 2 releases a year, I have little hope that that will change. Microsoft's official client is very bare bones and doesn't support connecting on non-standard ports (which I need).

Is there a remote desktop client for Mac out there that's both fully featured and not buggy?

Edit: Apparently the Microsoft doc I read that states that the Microsoft RDC client can't be used on non-standard ports is out of date.