Get a used Wheatfield HA-2 (they're now out of production and hard to find). There's one on Agon now for $600, or if you'd like to wait 2 weeks, I will likely be selling mine for $550 (once I get my speaker amps back, the headphones will unlikely see use for months). You will find no better Senn headamp for rock music, IMHO. Very fast attack, very full sound, and lots of dynamics.
