Really Good Macaroni and Cheese

I really don't normally make too many things with pasta, but if you are looking for a great macaroni and cheese dish, you've found it!  I can't claim that it's healthy, but I will tell you it's heavenly (if you like macaroni and cheese).

Ingredients:
1 16oz. box pasta, cooked according to directions
1/4 cup butter
1/4 cup flour
4 cups milk
3/4 tsp. salt
1 1/4 tsp. tobasco sauce
1 cup Gruyere cheese, shredded
1 cup sharp cheddar cheese, shredded

Bread Crumb Topping:
1/2 cup butter
1/2 cup bread crumbs
1/2 tsp. tobasco sauce

Directions:
Melt butter in a saucepan over medium heat.  Stir in flour until blended smooth.  Gradually add in the milk, salt and tobasco sauce and whip until smooth.  Cook until thickened and smooth, stirring often.  Gradually add in cheese and stir until melted together.  Pour over cooked pasta and mix lightly.  For the Bread Crumb Topping:  Melt butter, stir in bread crubs and tobasco sauce.  Sprinkle on top of pasta.  Bake in the oven at 350 for 15 minutes.