Most any mouse can be used for gaming: it all comes down to what fits your hand the best. I'm unfamiliar with the sidewinder but spending $100 on a mouse will not make you a better gamer.
I replaced my old mx1000 with the new razer.. not sure if its the deathadder or not. It has the two buttons on the left side but not the two in the top left corner. Plenty of adjustments to DPI and button mapping as well as a shape that fits my hand. If you're unsure go to Best Buy or a local hardware store and try it out.