The way I see it i think you can buy a submariner.It shows 300m martk on it and whose gona dive more than that.I have a sub mariner once and i used to dive wearing it.Never showed a problem and still working fine,i think.I have to sell my rolex uk due to some reasons but i am sure i'll buy another as soon i have money.So try not to mess your head with the ideas and listen to advices in the thread.