Which is a better combo?

[pokipoki]

Bought a M-Audio Firewire Audiophile. Which headphone is better to combo with this device for brain entrainment (trance music)? Senn HD650 or Grado SR325i? Thanks

M-Audio Firewire Audiophile Specs link

 

[grawk]

I wouldn't think 325is would be great for trance...