By production and current 2013 rating, it would be:
Peyton Manning (Denver Broncos) - rated 1 for 2013
Nick Foles (Philadelphia Eagles) - rated 2 for 2013
Philip Rivers (San Diego Chargers) - rated 3 for 2013
However, other than Manning, only 3 other quarterbacks are in the top 10 for all time best seasons by a quarterback since 2006 (the most productive veteran quarterbacks):
Tom Brady (New England Patriots) - rated 17 for 2013
Drew Brees (New Orleans Saints) - rated 7 for 2013
Aaron Rodgers (Green Bay Packers) - rated 5 for 2013
Tom Brady. The other person put Michael Vick and he abuses dogs. Plus the Patriots are the best anyway.
joe Montana
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
Peyton Manning
Steve Young