Sound is a crap shoot on any SLR video camera and can improve dramatically with the addition of sound accessories etc. I have some experience with this camera (Canon 60D) as a couple of friends have it and I have the big brother to it...the 7D. 60d| B&H Photo Video Combined with different lenses it is capable of good action sequences, great video and really nice picture quality.
I am a Canon shooter so it is easier to recommend the bodies I am familiar with but Nikon makes some really good bodies too including the D7000 nikon d7000| B&H Photo Video and other similar bodies. Sony has some really cool new bodies out too as well as you may want to look at the new mirrorless cameras from Sony (NEX series) and Nikon (Nikon 1 Series) with my leaning would be toward the Sony. The Sony NEX5n is on my short list. sony nex 5n| B&H Photo Video
Take a look at these and see what questions come up and I will be happy to help answer them if I can.