Place a greased 9-in. springform pan on a double thickness of heavy-duty foil; securely wrap foil around pan. Place pecans in a food processor; cover and process until ground. Add the gingersnaps, brown sugar and butter; cover and pulse until blended. Press onto the bottom and 2 in. up the sides of prepared pan; set aside., In a large bowl, beat cream cheese and brown sugar until smooth. Beat in the pumpkin, cream, syrup, vanilla and spices. Add eggs; beat on low speed just until combined. Pour into crust. Place springform pan in a large baking pan; add 1 in. of hot water to larger pan., Bake at 325° for 60-70 minutes or until center is just set and top appears dull. Remove pan from water bath. Cool on a wire rack for 10 minutes. Carefully run a knife around edge of pan to loosen; cool 1 hour longer. Chill overnight. Remove sides of pan., Garnish with whipped cream and pecan brittle if desired.