[PyMOL] What is the best 3 button mouse for PyMOL on a Mac OSX?

[Sarina Bromberg]

I have a logitech MX700 Cordless Optical Mouse that claims to be a 3- 
button mouse, but I can never get it to produce the results provided  
for 3-button viewing or editing by PyMOL.  Perhaps I do not have it  
configured correctly (I cannot find a clue in the instructions or in  
simple experiments), or perhaps this is not the kind of 3-button  
mouse I need. Does anyone have a good solution?
Tx,
Sarina Bromberg