I prefer taking in shirts from the sides. I do this will all my shirts and polos as I have the same issue as you with much widers shoulders than waist. I can't stand it when the shirts puffs out when tucked so I taper them down to avoid this. It is about 20 where I go for a shirt to be taken in and this includes sleeves, moving collar, etc. I pay this price becuase the attention to detail is worth it (i.e. matching the horizontal stripes on a polo). I don't like darts unless it's a last result becuase as you can see from the pics, they are noticable. Just buy shirts without pleats where the shoulders fit you perfectly and you should not have any problems taking in the sides. Pleats I believe sometimes means you will have to dart it.