Currently, they would be Matt Ryan (Atlanta Falcons) and Philips rivers (San Diego Chargers). Both are fairly young. Ryan was named AP Offensive Rookie of the Year in 2008, and was only the second QB in history to throw for over 3000 yards in his rookie season, while Rivers led the Chargers to a 12 game winning streak 2009. The best two rookie QB's from the 2010 Draft would be Sam Bradford (St. Louis rams, #1 Overall pick in 2009 Draft) and Tim Tebow (Denver Broncos).
Tom Brady
Steve Young
in what? not a very clear question
The NFL has a way of measuring the performance of a quarterback with something called a passer rating. The highest career passer rating is 96.8 by Steve Young. Click on the 'Passer Rating' link below to see how it is figured.
Tom Brady
Steve Young
joe Montana
Vince Young.
The best known currently starting NFL quarterback is Ben Roethlisberger of the Pittsburgh Steelers.
drew brees
Johnny unitas.
Jim Kelly
terry bradshaw
Tom Brady
An NFL quarterback.
Michael Vick
joe Montana