Best Camera for Use in Jitter on Mac

Hi all,
I was wondering what are the best video cameras to use in jitter on a mac.

I am using a logitech quick vision pro, I used in 640*480 for a while and get a decent fps rate, roughly round 30.
When I go up to 1600 x 1200 or 1024*768 – it drops considerably, to less then 10fps.
I’m using Max6 on OSX 10.7.5

Are there any other cameras that can capture, let’s say 1024*768 at better frame rates, through USB ?
Or is the limitation in frame rate rather due to OSX, Max or USB ?

Thanks
Frank