We love it when our guys are solid—when we can count on them to show up, stick to the routine, behave predictably. And when it comes to their hair—predictable is the word. Most guys stick to the same basic haircut for most of their lives. The pros at American Crew get this, which is why they have created solid education geared for the classic cuts that your male clients request again and again. And at their banging Opening Night event in Denver, recently, they went so far as to select and showcase the three most iconic cuts of…