For the brief time i owned it i loved the gigabyte mx8000, for its excelllent weight balance system and high dpi. you dont have to use all the buttons, but they can be bound in game
The corsair k65 is good, and has funky backlighting.
im now using the corsair m95, i adore the side buttons, its most hated feature. If you have a large thumb the complaints are meaningless as you can just rock your thumb to get all 9 buttons (wimps moaning about them being unable to find the right button with twig fingers)
however you have to bind the buttons to unused keyboard keys in software, then bind games to the keyboard keys for the mouse buttons to work.
or a razer deathadder is possibly the most comfortable simple mouse i have used.