Buy a Gamepad for KMS?

I'm thinking to get a gamepad finally so I can play KMS without Keyboard, but I need the best choice for it, best, but economical. My laptop's an Acer, if that helps.

Any ideas?

http://www.logitech.com/en-us/gaming/controllers

Logitech F310 is pretty reliable. If you have a PS3 (Controller), you can use that instead.

Ahh, thanks very much.