I like the Saints for several reasons. I think that the Saints are actually better than the Colts. The Colts captured a lot of media -- and public -- attention with their run at a perfect season. Although they a few "meaningless" games at the end of the season, many consider them "perfect."
The Saints have put up some monster numbers and are a truly "live dog."
Public sentiment is clearly on the veteran Colts, but there seems to be value on the Saints. In addition, I found this sports psychology angle to be interesting: