USB Camera recommand?

There are few camera are using Firewire nowadays. If I am now using iMac, which kind of camera do you guys recommand? Is there any “USB” Cam can work with iMac with better quality?

You need to use a USB webcam, as USB camcorders don’t deliver a live video feed.
You might wanna take a look at these:
http://boinx.com/chronicles/2011/5/10/ipevo-camera--the-best-istopmotion-usb-webcam-/
http://boinx.com/chronicles/2011/3/25/testing-the-hue-hd-webcam/
http://boinx.com/chronicles/2011/3/17/spotlight-on-panasonic-ta-1-flip-cam/

The downside of these is, they all do auto exposure and auto white balance.

http://www.blackmagic-design.com/products/ultrastudio3d/

can this use for live capture? or other thunderbolt hardware recommanded?