Preheat oven to 375 degrees.
With a hand or stand mixer, whip together the cream cheese, cheddar and jack cheeses, mayonnaise, pimentos, lemon juice, Worcestershire, smoked paprika and a couple of twists of the black pepper.
Spread the pimento cheese evenly in the bottom of a large, greased baking dish.
Place the crab meat in the bottom of a large, clean glass bowl. In a separate bowl, whisk together the melted butter, Durkee's Sauce (or honey mustard) salt, red pepper, dry mustard, lemon juice and egg yolks. Pour the dressing mixture over the crab and gently fold together with a spatula.
Sprinkle the cracker crumbs evenly over the crab mixture.
Beat the egg whites until stiff peaks form. Add the egg whites to the crab and cracker mixture and gently fold everything together with a spatula until well combined.
Spread the deviled crab evenly over the top of the pimento cheese.
Bake for 30 minutes, or until nicely browned on the top.
Serve warm with Town House Crackers to dip.