If you're umming and aaahing about which size of Nautilus to get, here is as graphic a demonstration as you'll ever get of why the 3800 stayed on the shelves and the 5800 will too. People often get confused over the dimensions of a Nautilus case what with the ears. Now look above at the real effective cross bezel diameter of the 5800, the vertical dimension: it's a laughably tiddly 33.2 mm. The 5711 on the other hand is 38 mm.
Having discussed wrist sizes, I recently had the chance to compare the 'smaller' Nautilus with the 'large' on my slightly above average at 7.25" wrist . Hmmmm, glad I didn't buy the small one.... "Is that a ladies watch sir?" Note that the 3712/1a and 5712/1a with moonphase are in the large size. Goody.
Ridiculous 'ladies' size 3800 above