98.6 quarterback rating.
Tom Brady received a perfect qb rating against Miami in 2007 (158.3). Michael Vick also received a perfect qb rating in 2010 against the Redskins (also 158.3).
In 2009, Eli Manning had a 93.1 quarterback rating.
Peyton manning has had 4 perfect passer rating games. Next best is Ben Roethlisberger with 3. 2 of witch were in same year making him only quarterback to have ever done so.
As of this posting it's Michael Vick with a rating of 108.7
Tom Brady with a rating of 111.
For the 2008 season, it was 80.1