Look at CNET Reviews and http://www.camcorderinfo.com/ for "prosumer" models. As CES is underway and models change all the time all I can offer is that for better audio you get a mic. And you put in on top and live with the better results. Here I prefer to get more than one audio recording (I use a sound recorder) and we can pick the best in post production.
My brother plans on creating his own automotive video blogs and is willing to spend up to around $600 for the best audio/video camcorder. He will use this primary camcorder for when he is outside, discussing the cars features which, naturally, means he needs crisp video with the ability to enhance the audio. He may also use it to show the car driving around a track so motion/frame rate must be smooth. If you all could help direct me to the camcorder/external mics that would best suit his needs that would be much appreciated. (Right now I'm thinking Panasonic HCV700???)
Also, he will likely use a live action camera and is most likely to get a GoPro Hero 3 Silver (Wants to spend no more than $300 on live action), would you suggest the Hero 3 over the Contours or any other?
Thank you very much!