Funny, I was actually coming around to actually doing the same thing as you all described. I was using rough sound to cut and sync the video and then bringing it into Sonar X3 for a final mix of the audio.
I'm doing it that way because I notice Sonar has a hard time dealing with a lot of formats and different frequencies in an efficient way. (in other words in converts a metric ton of stuff and cant play different formats directly from my experience)
Honestly, I'd like to feature request that they add more supported file formats for audio and video. It's pretty time consuming having it deal with everything and convert it down to a format it understands.