I personally do not have the budget *yet* of these high-end fancy smancy cameras, so i can't help you with that.
What I can help you with is this:
The Logitech HD Pro C920, a brilliant, and most definitely the BEST webcam you can have. Mind you, the microphone on this sucker is terrible..don't use the microphone, use the video only. You will thank me later if you get this. You can buy it at a good price on amazon, and some stores carry them aswell.
Pros:
Everything cept microphone ( fades perfectly, brilliant resolution, easy to use )