Who if anyone can stand in the way of the Cowboys quest for a Superbowl in 08?

I see the Cowboys being even better in 08 than 07...They have juiced up at corner back and running back...they barely lost to the Giants in the Playoffs...(just ran out of time on the last drive)...im pumped about our chances! Can anyone stop us?!...I'm looking for two answers...who will be the toughest competition in the NFC and who will we beat in the Superbowl?