Crust: Make graham cracker crumbs using a food processor or blender. Stir in melted butter and 1/4 cup sugar. Place in bottom of a 9 inch spring form or pie pan. Press in place with a fork. Refirgerate while making the filling
Filling: Beat eggs. Combine cream cheese, 2/3 cups sugar, salt, eggs and 1/2 teaspoon vanilla. Beat at medium speed about 5 minutes. Pour into a pan over graham cracker crumb crust. Bake at 350 degrees for 25 minutes. Cool 30 minutes before adding the sour cream topping.
Topping: Mis sour cream, 3 tablespoons of sugar and 1 teaspoon of vanilla. Spread on top of cheesecake. Bake 10 more minutes at 350 degrees. Cool to room temperature the place in refrigerator. Chill before serving.