I have two Logitech QuickCam Pro 9000 cameras. Can I add a couple of the PS3 Eye cameras to round out the mix or do they all have to be the same model?

We strongly recommend to use cameras of the same model.

If you mix Logitech and Sony cameras, inevitably you'll have different color and image setting in different cameras, and this can prevent the system from working correctly.

hi, i have 2 Web Cam Pro9000 and this camera have a terrific frame rate... with PS3 Camera i can record with 6 different point in 640x480 30fpt ... 320x240 60fps.

note: first problem is storage driver... is a good idea play it with Raid storage in stripping for your best performance.
if you play with 6 camera you need a speed write near 110MB/s to use 640x480 60fps... then limits is in HD speed. but im start with this test only 1 week back in casual time for play with it.