Cameras to buy? Which one?

So I'm looking for the HIGHEST quality DSLR Video camera for $950 or less (for camera body)… So I had some questions:
1) Should I buy Nikon D3200, Nikon D5200, Nikon D7000, or Canon EOS60D

2) Are more megapixels better (I.e. 20^)

3. Should I buy a extra microphone? (I want good sound--I remember watching videos with horrible sound and getting chills)

4. Are there any camera suggestions you guys have?

5. Why are cameras video time limited to like 20 minutes?

6. If anyone knows him, what camera does FreddieW use?

*please, only answers from learned professionals or people who are extremely good, and knowledgeable photographers**

1. I'd recommend either the Canon t3i, t4i or t5i.
2.No. The mp count really doesn't mean much except for technical quality which effects photos published in magazines and on large posters. For the average photographer that count, as long as it's at 10 or above, doesn't mean a whole lot. In fact there are people getting wonderful dslr photos at 6.
3. Extra, what for? If the camera you buy has an audio input, which the recommendations above do, it'll only take one mike anyway. If you buy and want to run more then you'll need an external mixer along with your camera. More equipment, more things to go wrong.
4. I gave you my suggestions.
5. Because of sensor heat. When the sensor is working, gathering light, billions of electrons are flowing through it. Those little guys cause friction which causes heat. To much heat will destroy the sensor - so, the time limit. Actually most are about 12-minutes.
6. Don't know

I will start with your second question:

2. More megapixels does not necessarily mean better image quality. Other aspects, such as sensor size, are more important. DSLR cameras have big sensors, and even a 10 megapixel DSLR can take great pictures.

3.It is best to decide whether or not to buy a microphone when you have already tried shooting a video with your camera. Generally, you might get wind noise with a built-in microphone when outside - if you do have this, then consider an external microphone

4. If you want a DSLR, I suggest Nikon D7000 http://www.superbcamera.com/camera-photo-video/digital-cameras/nikon-d7000-162mp-dxformat-cmos-digital-slr-with-30inch-lcd-body-only-com/

If you are also open to a compact system camera, I suggest Sony NEX-7 or NEX-6, which has a DSLR-size sensor http://www.superbcamera.com/camera-photo-video/digital-cameras/sony-nex7-243-mp-compact-interchangeable-lens-camera-with-1855mm-lens-com/

5. Here are the possible answers: http://www.dvxuser.com/V6/showthread.php?268699-D7000-users-Reason-for-the-20-minute-video-limit

6. No idea, but I you might also find Mike Palmieri inspiring:

1. Nikon D7000 or SONY NEX-7/ NEX-6, and actually Canon T3i is a great choice too, as Jim suggested. You can watch a video review of that one here: http://www.superbcamera.com/camera-photo-video/digital-cameras/canon-eos-rebel-t3i-18-mp-cmos-digital-slr-camera-and-digic-4-imaging-with-efs-1855mm-f3556-is-lens-com/

1) Any will do. All dSLR's are good. All are basically the same. If you don't know what to get, go for the most expensive you can afford.

2) Megapixels only tell picture size, nothing more. If you are going to print to bus or billboard sizes then go for as much megapixels you can afford. If not, 6MP will do.

3) If sound is terrible I get mad. I get chills when I see mother-in-law. Get a microphone if the dSLR you are buying has a microphone port.

4) Pentax K-30.

5) It's a technology limit. You'd be better off shooting at 5-minute slices though for better sound syncing.

6) I don't know him but there's no guarantee that if you get the same camera he uses, you'll get the same results. Picture and video quality depend mostly on user skill. The camera is only a tool.