There are a variety of mice to choose from. Most are happy with a simple mouse, but you should consider that the mouse is the most used peripheral on your computer, right next to the keyboard. A nice mouse really makes a difference in using your machine and will keep your hand comfortable for long periods of usage. They come in many styles and shapes, some have extra programmable buttons and/or a track ball, which is a sphere that you can control with your hand to move the cursor. Some even have removable weights to adjust how heavy the mouse is.