Trying not to hit $1,150. Current is $1,087.90. But maybe a mouse under $50?
If someone posts a mouse over $50 ignore them. Mice are cheap and all sorts of extra buttons just get in the way for gaming. Ideally you have a 3 button mouse (including the scroll-wheel-click). You will probably never use any other buttons.
I actually disabled the 2 extra buttons on my 5-button mouse because sliding your finger over them = accidentally do something.