I have made this pie twice in one week. I had extra pumpkin, yes, but it really is fantastic. It's veering into the 'much too much' category for me-ultra rich, ultra sweet- but my roommate is in love. Maybe you will be too.
The recipe comes from Bon Appetit's Thanksgiving issue from 2009, and I've made no modifications. You can find the recipe here.
It looks much more elaborate than the Sour Cream Pumpkin Pie, but is actually much less involved (no cooking of the filling pre-baking).
Start by making the streusel-y topping (chopped walnuts-though you could definitely swap these for other nuts-pecans, hazelnuts, even almonds would be nice, brown sugar, cinnamon and a touch of salt):
The shell is then blind baked with pie weights/pennies/beans to hold its shape.