Form fitting mice

Do you guys know of any form fitting mice? Ones that fit right in the hand and don’t hurt after extended use? I used this big mouse that is cramping up my hand, and I want something that is more formed to the shape of the hand. Do you have any suggestions?

I’m currently using a verbatim wireless mouse. It’s one of those big mice that has a small portion of the left for your thumb. It looks like this:
[IMG width=“413px”]
It took me a while to get used to the size, but I prefer it over other mice. It’s probably not the best for gaming though, but it works for me when I game and work. As well, the paint chips on this easily, so you may want to keep that in mind.