Just wanted to comment and say thanks for the pic, OP.
In all seriousness I used to do headphones as a hobby before I got my BMW. Thousands spent on custom wiring, amps, DACs, etc. And a lot of research into actual sound waves and studio recording.
Anyways I used to shop here a lot:
They have a lot of quality products. Take a look around, see what's in your price range.
And if you really want to go nuts:
I used to shop there a lot too ... they have some true high-end gear.
2011 BMW E92 335i, 6MT, M Sport, Le Mans blue - Michelin PSS, Quaife LSD, JRZ RS Pro, JRZ camber plates, Eibach ERS, full M3 susp, custom toe arms, Powergrid end-links, brake ducting, SS brake lines, UUC SSK, ETS FMIC, ER CP, Perf. Exhaust, work by VAC Motorsports