In a medium skillet, fry the bacon slices until slightly crisp. Drain on paper towels and set aside to cool.
In a large bowl, combine the mayonnaise, buttermilk, sour cream and garlic. Add the vinegar, Worcestershire, salt, pepper and cayenne and whisk until the mixture is totally smooth.
Chop up the bacon into pieces. Cut the iceberg in half right through the middle, then cut the halves into wedges.
Spoon a good amount of the dressing over each wedge so that it drips down the sides, then sprinkle on the cheese and bacon.
Variations on this salad: Add 1/3 cup crumbled blue cheese to the dressing for a nice tang; use grated pepper-jack cheese instead of Cheddar for a little kick; or sprinkle 2 tablespoons finely diced red onions over the salad for added flavor.