The Sidewinder mouse is very large. Don't buy it if your hand is small- mid sized. You're better off buying some Logitech mouse. I'd say you buy a Logitech MX518 which should cost around 1.5 K. Other mice have higher DPI but you won't need so much anyway.
1. sidewinder is large and it feels to flimsy under the weight of my hand.
2. Genius 535 Navigator has awesome ergonomics and features but its mouse click is hard. Everything else is awesome. I they soften the click it will be the best mouse. Its 1.8k -2k
3. Copperhead has a rubber grips on side which protrude too much causing inconvience to little and ring fingers. Its 3.2k
4. Diamondback is like copperhead but without the problem. Its not laser and has less lift off distance. It works awesome with goliathus mouse pad. Its 2.5k.
5. MX518 is very large and it forces you to use ergonomic grip. Can't do finger or claw like the above 3 mice. But this is the highest bought mouse in my college due to its cost. Next is diamondback.