In troubleshooting this problem, I swapped out my current wheelset for another set that is on my wife's bike and then went for a test ride and the noise was gone. I then took my "bad" wheel to my LBS thinking it was either the bearing in the freehub body and/or the bearings in the rear hub and they confirmed my suspicions and said it was the bearing on the freehub body. They ordered a bearing for the freehub body. Problem solved. Thanks to everyone for the responses.