Here is the current version of my house plan. We've cut off the two downstairs extra bedrooms, flipped the house (to the left is north) for better views and reduced the size of the formal living-dining room. This layout lets us put the formal entrance and front porch on the narrow end of the house and well away from our mud entrance and our parking area - and I can have the porte cochere I always wanted!

I've got a similar layout with the half bath moved to the library so the library could be used as a guest room, but this one seems more efficient since it clusters all the plumbing together. I'm just not sure which would be better for getting plumbing upstairs for the bath and bedrooms upstairs.