I think I have some issues with my Kensington trackball (mouse)

Thought it might be worth asking what others that do a lot of iCLone type work would recommend as a very good mouse. It's no sense to hold onto something that important to your work, if it doesn't work well.

I am left handed mouse user for the most part (ambi-dextrous). When my wrist starts hurting I change hands. What I'm saying is... a right hand only mouse thing won't get it for me.