My business partner recently bought a 3d mouse. It's called the SpaceNavigator by 3Dconnexion. Website is 3Dconnexion : Start
I tried it out in SprutCam. It took me a few days to get used to it, but WOW. I am in love with it. It makes rotating the model so much more accurate. Very well built for $75. Just thought you guys might like to know about it.
Tom