Buy it on: Amazon
Are you all about extra options? This is the gaming mouse to pick if you don't want to spend $70-$120 to get a ton of additional buttons.
The main selling points here are the removable weights and the 18 (yep, 18!) programmable buttons, with a whole matrix of buttons on the left side.
Why would you need that many? This level of customization is particularly useful for MMORPG players who have tons of skills and attacks that need to be used regularly.
I promise, once you realize you can tap the button with your thumb rather than searching for a number on the keyboard, you won't want to ever go back to the old way of playing again.
The only downside is that the increased size on the back end can get a little uncomfortable during prolonged gaming sessions if you have small hands.
If you like this style with the matrix of extra buttons on the side, be sure to also check out these models (although the Razer and Scimitar are a tad more expensive):