The Colts would certainly prefer to play the Pats over the Chargers.
This Manning in the playoffs against the Patriots stuff is pure bunk. In 2001, the Pats swept the Colts in the regular season, winning two blowouts. In 2002, the teams didn't play. In 2003, the Colts lost to the Pats at home and then lost in the playoffs on the road. In 2004, the the Colts lost to the Pats on the road, and then lost to the Pats at home.
To recap, the Colts are now 0-6 against the Patriots, including three games in Indianapolis. The Colts stunk against NE in the regular season, and stunk against NE in the playoffs.
The Pats had a good amount of turnover since then. And guess what? In 2005, the Colts beat the Patriots in Foxboro. In 2006, the Colts beat the Patriots in Foxboro. Do you really think they'd be afraid of playing NE at home??
If history holds, the team that won in the regular season would win in the playoffs. From 2001-2004, the Pats were always the better team, and that's why they won. In 2005, the Colts were clearly the better team, and they won. This year, I think the Colts were the better team at the time they played, although I think NE might have been the better team this year.
But there's little reason to think "Manning against the Patriots in the playoffs" scares the Colts at all, unless the Pats are bringing back Romeo Crennell, Charlie Weis, Eric Mangini, Joe Andruzzi, Deion Branch, David Givens, Ted Johnson, Ty Law, Willie McGinest, David Patten and Adam Vinatieri.