the watches are NOT the same. in fact, they are not even close. the build quality in the cheaper bentleys you listed are very bad compared to what you can get for just a little more. if it has to do with money....i would HIGHLY suggest you save a little more and buy something of good quality.
my friend, we are dealing with reps....there is not such thing as a 1-year warranty. not only is the mvmt worth $100 more, but like i said before....its the accuraccy and overall build quality.