A friend of mine is trying to sell me his AW 4 44mm GPS model, it is practically brand new no scratches or blemishes from when i inspected it. He wants to sell it for $200, is that a good deal for AW4? or should I go with AW5? Looking online at a few websites, AW5 is running at $350 used. Any advantages on AW5 over AW4 besides AOD which is good but not a must have. Thanks