We're now officially in "high end" territory and on the cusp of leaving behind the quaint village of budget-friendlysburg. At 16,000 DPI you don't really get better responsiveness than this.
For MMOs, MOBAs, or survival sims where you might want to assign a bunch of different keys to a specific mouse click, you can't get much better than what the Naga Hex offers.
There's seven conveniently placed buttons right next to your thumb for rapid firing out those abilities as soon as their cool downs end, along with two more on the top. The only potential downside is the rounded, curvy design, which is quite a bit different from Razer's flagship Death Adder.