I usually go with Livestream. It can manually capture the window for WoW and only the window, making it so honorbuddy doesn't get captured in the screen.
Open Broadcaster Source is probably the best you're going to get.
It's free and has tools for setting up the recording specifically to how you want prior to actually recording.
Although it's important to note that Bossland has legal action to take down any video that has the Honorbuddy GUI in it.