Preheat oven to 350°F
In medium pot over medium heat, melt butter. Add flour and whisk for 3 minutes until lightly browned. Add heavy whipping cream, half and half, garlic, cayenne, Worcestershire sauce, salt and pepper. Stir for about 3 minutes over medium heat until slightly thick. Remove from heat and add sun dried tomatoes and cheeses, reserving ½ cup white cheddar, ½ cup monterey jack and ½ cup blue cheese. Stir until cheese is melted into sauce.
Butter 13×9-inch baking dish. In large pot, add sauce to pasta. Stir until pasta is evenly coated. Pour into baking dish and spread evenly. Sprinkle reserved cheese over top. Sprinkle with paprika if desired. Bake 25-30 minutes until bubbly. Let sit 5-10 minutes before serving.