Sorry if this is in the wrong subforum...

I play a lot of my old school video games through emulators on my mac, and would love to purchase a simple gamepad to plug in for them. Unfortunately I have no idea where to start.

Here are my mac specs:
MacBook pro 15-inch, Late 2011
Processor 2.2 GHz Intel Core i7
Memory 4 GB 1333 MHz DDR3
Graphics AMD Radeon HD 6750M 512 MB
Software OS X 10.8.2 (12C60)

Here are the programs I'd like it to be compatible with:
- PCSX-Reloaded (PCSX-Reloaded - Home)
- Snes9x (Snes9x)
- SixtyForce (sixtyforce)

Any recommendations?