Kid David has the best musicality of any bboy I've ever seen in my life. He doesn't just hit beats, he flows with the music and lyrics consistently more than any one else out there.
That set against Jinjo was tight, but this one against House of Reps might be my favorite of his from 2011:
http://youtu.be/3dJ7jR9dqUM?hd=1&t=55s
The beat hitting is not as obvious as the #1 F-Rock set, but the level of musicality is just crazy good.