Quite a nice mix of Aquanaut/Nautilus and AC, PCC, chrono, split second. If you are looking to add to the collection, I would look to add a simple Calatrava or a Minute Repeater on the other end of the spectrum. A Calatrava would be a simple, yet elegant dress watch that is quite different from the complicated dress watches already in the collection. On the other end of the spectrum, a minute repeater is a collector's watch, that has a more historical significance. And no one does a MR better than Patek.