Gaming Mouse Help

I'm using a logitech mx518 gaming mouse...its not the latest but it is a really good mouse.

When I first bought it, the price was $120, now its around that price range of 30 to 40 dollars.

Has some really cool features and settings to improve usability.

Its optical but really good mouse to have.

 
I use the Microsoft sidewinder x3 got 2000 dpi and can switch between 2000,800,400
or you can customize the speed but if you really want a decent one go for the x8 but recommend save but x3 is good enough in my opinion