My best mouse has to be the Microsoft Explorer. Smooth as ice. Sadly, the quality of optical sensors seems to be regressing. I've recently been using the Razer

My best mouse has to be the Microsoft Explorer. Smooth as ice. Sadly, the quality of optical sensors seems to be regressing. I've recently been using the Razer Naga - the optical sensor comes close and it fits perfectly in my hand - I barely notice that it's there. It's worth a try if ergonomics is important to you. YMMV, my ergonometrics aren't the same as yours.