In a small bowl, combine the graham cracker crumbs and sugar; stir in butter. Press into the bottom of a 9-in. springform pan; chill. , For filling, in a large bowl, beat cream cheese and sugar until smooth. Add eggs, beat on low speed just until combined. Stir in the pumpkin, spices and salt. , Pour into crust. Place pan on a baking sheet. Bake at 350° for 50 minutes. , Meanwhile, for topping, combine the sour cream, sugar and vanilla until smooth. Spread over filling; return to the oven for 5 minutes. Cool on rack for 10 minutes. Carefully run a knife around the edge of pan to loosen; cool 1 hour longer. , Refrigerate overnight. Remove sides of pan. Top with chopped pecans. Refrigerate leftovers.