DT's are the best in the business, hands down. I even bought some to start swapping out my dress socks, got tired of being the hobo with his toe through the hole in the TSA line.
I can literally go 300-500 miles before I wear a hole and then get a new pair in the mail.
I have one light pair for the gym and early season, the light hikers for Sept - Oct and two thicker pairs for November & December.