You can get a far cheaper and just as good extension cable from ThatCable on ebay.
Grado are recognised as the rock headphones because of their dynamics and attack. They really drive the music along. Other alternatives depend on you like of bass. Some brands such as Sennheiser, Beats and Sony do BASS headphones where they have a bass boost or emphasis on the bass. Others such as Grado and AKG have bass, but it is more in the detail and for the rhythmic impact. So their bass does not drive or overwhelm the music. I would say that the latter are the 'audiophile' choice. In the middle and in budget are the Denon AH D1001, which can overwhelm with BASS and IME with other recordings, get it spot on.
You can narrow down your choice by deciding if you want open headphones, which leak sound, or if you need closed headphones, which leak less, but often still some sound.