> I don't care so much about it being waterproof, but I care a lot about the existence of a headphone jack.
They're not mutually exclusive. Until the latest generation, flagship Xperia phones have been waterproof and boasted a 3.5mm socket. Last few years of Galaxy S phones have also had both features.
You never know when you might need a phone to call the emergency services and you don't get to choose the weather at the time; just look at the weekend's headlines. The idea of altering one's behaviour to suit a gadget is placing the cart before the horse.