for the most part - you get what you pay for when dealing with *reputable* dealers. In some cases the cheap version will have the same case and construction as the expensive one but will lack the Swiss movement or the movement will be a real cheap one (DG2813 vs Asian 2824), lack AR (Anti-Reflective) coating and come with a cheap strap - if you're not picky, you can get many nice watches at a low price point but for the watch connoisseur, only the best version will do. Generally, the rule is - you get what you pay for.
pick your dealer 1st, then your watch
also, NO NEED TO YELL