What is the best/cheapest HD camera for recording concerts?

I go to a lot of rock concerts such as Paramore, My Chemical Romance, Green Day, and tons of small time concerts and I love to record them on my camera for youtube. However, my camera isn't HD and the sound and video quality are always terrible. I am looking to buy an HD camera but have no idea what to get. What is a nice HD digital camera with very good audio and video quality that would be good for recording concerts with lots of noise and movement?