What would you rate as the best controller for PC gaming?

I am debating on getting a better one. The one I use now is just a generic Rock Candy one which has been good but the sticks are finally acting up.
I got my husband a standard plug in xbox 360 controller, just plane black and it seems to be working out just fine for him. I might get one myself...
Question though, is there a better option?

I threw that rock candy one away... it was junk... anyone got better ideas? I seriously need one asap!