Well if a decision hasnt been made I will throw another shot at the Beyerdynamic DT770...though I prefer the 80ohm version. Does well with my Galaxy S4(no ext amp or dac), and even better with my Parasound Zpre/Beheringer UCA202(nice but temporary as I decide what tube amp to build). I understand that cosmetics are a concern, but hey sometimes being the "different" kid with the really good sounding headphones might sway the masses away from "Beets" and the like. Also because the 80 ohm version works with both low and high level inputs, your son might want to get an outboard dac/amp with the extra cash...I just got my 770/80 for $179US shipped in and to the US....YRMV. If he really doesnt like the style and is handy at all with woodworking/electronics, the Beyers are notorious for being modified, show him some pics of some Darthbeyers or something. I happen to have an abundance of 1/4" plexiglass and will be making some modified cans eventually. Even painting or airbrushing the stock 770/80 cans would give it a unique look. There are a few versions floating around the board that look pretty cool...
Just a few thoughts....basically dont forget about UPGRADING....sounds like your son might of already caught the headphone buzz...no pun intended......
, and getting over "what everyone else is doing" is a life lesson never learned too soon...IMHO......