What's the best game controller for a MacBook Pro?

I have a mid-2012, non-Retina, 13" MacBook Pro with a 2.5 Ghz i5 and 8 GB of RAM. My current OS is 10.9.1. I've played Starcraft 2 for some time without any problems, but there are a few newer games on the Mac App Store that look like they'd be no fun with a keyboard and mouse. I'm hoping people here have recommendations for the best game pads or controllers that are compatible with Mac.

Please let me know if you have a controller that works really well for you, thanks!