Best camera for a beginner YouTuber?

Well, personally I would then do something that doubles as both a still and video camera that has fairly wide depth of field so that you can both take product shots and all of your production video with the same device. Something similar to the Panasonic GH3 would do nicely, especially if you can get a nice deal on a used kit with lenses already.

 
Get a DSLR with video functionality, I've seen multiple people use these cameras for their film making and it looks really good. I recommend the Nikon D7000 (forgot the price but I think it's around $1000).