Place potatoes in a large saucepan and cover with water. Bring to a boil. Reduce heat; cover and cook 15-20 minutes or until tender., Meanwhile, cook bacon in a large skillet over medium heat, until crisp. Remove to paper towels; drain, reserving 3 tablespoons drippings., Drain potatoes and place in a large bowl. Add bacon and reserved drippings; toss to coat. Refrigerate until chilled., Whisk the mayonnaise, dressings, sour cream and mustard in a small bowl. Pour over potato mixture; toss to coat. Stir in onions and cheese. Sprinkle with pepper if desired.