I have 24" white iMac 2,16GHz and I am looking to buy new webcam which will gave better video recording quality than built-in iSight.
First, I was thinking of Logitech® QuickCam® Vision Pro for Mac® link but after reading this review I gave up from Logitech.

Please can somebody gave me advice which webcam to buy?
I am using EvoCam software for recording, webcam should have as high as possible resolution (min. 640x480), it should be able to catch speed movement without blur... in short: to be better than built-in iSight (and price should not exceed 150$)

btw I also think about Agent V5 webcam but I can not find good review for it on web.