Preheat oven to 350°. Bake pecans in a single layer in a shallow pan 8 to 10 minutes or until toasted and fragrant, stirring halfway through.
Stir together graham cracker crumbs, next 2 ingredients, and 1/2 cup toasted pecans until blended. Press crumb mixture on bottom, up sides, and onto lip of a lightly greased 10-inch deep-dish pie plate.
Bake at 350° for 10 to 12 minutes or until lightly browned. Remove from oven to a wire rack, and cool completely (about 45 minutes).
Sprinkle remaining 3/4 cup toasted pecans over bottom of crust; drizzle caramel topping over pecans.?
Whisk together sweetened condensed milk and next 3 ingredients. Gently pour into prepared crust.
Bake at 350° for 20 to 25 minutes or until almost set. (The center will not be firm but will set up as it chills.) Cool completely on a wire rack (about 1 hour). Cover and chill 4 hours.
Beat whipping cream at high speed with an electric mixer until foamy; gradually add powdered sugar, beating until soft peaks form. Dollop or spread over pie.