I have narrowed my new mouse down to the Roccat Savu and the Logitech g100s. What I want to have in my new mouse is for it to be nice and light, for it to have an optical sensor with no acceleration,good tracking and durability. I have looked at mice like the Steelseries sensei, Steelseries kinzu v2, a number of razer products and some mice from logitech but all of them don't fit the check list like the Savu and g100s do. I have medium size hands so the size of both the Savu and g100s are great.The Roccat Savu has a right hand design that lets you place your thumb on the mouse comfortably but I heard that grip of the mouse wears off over time. I also read on some fourms that the Savu has some smoothing on the mouse. On the other hand, the logitech is cheap and what I heard, seems to have good tracking. The only con I can think of for the g100s is comfortability. What mouse do you think I should purchase?