I hope we play anyone BUT the Broncos if we are lucky enough to make it that far. That said, who isn't dreaming of a showdown between a pair of 18-0s? It's crazy, but I think Seattle and Denver are 18-0 candidates. Not likely, but certainly candidates.
I lived in Colorado for seven years, I was there when SBXL happened and when I first joined this site (over at scout at the time). I have a ton of die hard Broncos fan friends. In 2005, we very nearly had a Broncos-Seahawks SB that year (Seattle and Denver hosted the AFC/NFC championship games). Going back about 10 years or so, I've always wanted a Seahawks-Denver SB just because of how cool yet weird it would be. I think this year, the dream finally happens. Maybe my stupid "23-0" dream happens too, but the Broncos one is far more likely.