Don't kid yourself if you think San Fran isn't a legit Super Bowl contender. They split their regular season series with each team winning at home and the NFC championship game was decided by 6 points.
Arizona had the 12th ranked offense and 6th ranked defense in the NFL last year, they added some good young talent the past few years in the draft who will continue to get better. They also were only the team to beat Seattle at home last year. Don't be so quick to count them out.