Fill a medium sized pot with water and bring to a boil. Cook macaroni noodles along with the cauliflower until tender, about 15 minutes. In the meantime, cook the bacon until crisp. While the bacon and noodles/cauliflower cook, melt the butter in a sauce pan over medium heat and whisk in the flour. Whisk in the milk gradually to prevent lumps, and then add the salt, pepper, and cream cheese. Whisk until the cream cheese is melted and then stir in the parmesan and 1 1/2 cups cheddar and allow it to melt, stirring frequently. When the noodles are done and the cheese is melted, drain the noodles and combine with the cheese mixture. Crumble three pieces of bacon and stir in, then transfer the macaroni to a baking dish or oven safe skillet. Top with the 1/3 cup cheddar and crumble remaining bacon over top. Bake at 350 for about 5 minutes, until everything is hot and melty. Serve immediately.