not sure who else would be a better Rivalry right now.
THe one that is often brought up is the Ravens/Steelers but recently that matchup has been two rosters full of old players trying to beat up on eachother without hurting themselves, and obviously the Ravens had the last laugh.
The NFC East is probably the division with the most 'storied' rivalries but between the inconsistent Giants, blown-up eagles, Tony Romo's failures, and RG3's ankle the games just aren't that good.