Probably not. The DC universe doesn't have an official "power ranking" like the Marvel Universe has, but there are always strong supervillians roaming around. Batman has fought basically everyone ever, thanks to his presence in the Justice League, so he's definitely fought someone more powerful than Bane.
No, Nolan chose Bane because Bane was the only villain from the comics who ever really managed to "break" Batman. He did this in the classic Batman story arc Knightfall:
In this story arc, Bane broke Batman's back, requiring him to go into therapy to heal. It was one of Batman's greatest low points. The Dark Knight Rises seems to be about Batman suffering through extreme trauma and coming back from defeat, so it's appropriate that Nolan has drawn from the Knightfall story arc. The arc not only dealt with Batman's suffering, but with the suffering of the entire Gotham community: while he was out of commission, a mentally-unstable superhero named Jean-Paul Valley replaced him and put Gotham at serious risk. You can read about it here: http://en.wikipedia.org/w
Probably in preparation for the film, DC recently reissued the collected editions of Knightfall. You can probably find them at your local comic book shop.More questions on Batman: