Recommendations for best Mac Webcam

I am getting a Mac Pro in early December and would like to buy a Webcam for iChat and Video Conferencing purposes and I was wondering what would be the best webcam to get for my new Mac Pro. I understand the "iSight" camera is no longer manufactured so what options do I have -- or should I spend the extra money (and the premium cost for such an item) for a product that's no longer made?

Thanks for your help.

Doesn't the Mac Pro already come with a built-in iSight?

The iMac comes with integrated iSight camera in their system/display, but the Mac Pro is just the desktop computer and doesn't come with an integrated camera. I will be getting the 30-inch HD Apple Monitor and that is just a monitor with no integrated camera.

Thanks, Jeff. I have both an iSight and also a Logitech Orbit. I like both.