headphone pre-amps

I use the Grado headphone amp with my Senn 600's, works great and is reasonably priced at ~$200

The list for the Grado is $350.00. Jefflostrarca, can you let me know where you got yours for $200?

Don't have a comparison to offer, but the Senn 580 sounds really good being driven by my Linn Majik. I'm curious about the special circuitry in Headroom's amps that supposedly get the voices outside of your head, but I'm not willing to spend the $4-500 I'm guessing it would take to improve on the Majik's sonics. Haven't heard the surround-processor/amp that's being sold with the 580 now. IMO, the packaging of the DSP with the 580 has a gimmicky feel to it that belies how fine of a headphone the 580 is. But of course, Sennheiser would want serious listeners to spend 75% more on the 600. Can you turn the processor circuits off so it's just a straight headphone amp? Do you have any gripes about how the 580 sounds through the DSP?

to jayboard-no, I don't have any gripes. It sounds good using them either as a straight stereo headphone or as a surround processor.I actually like the sound better in DSP mode--but not substantially better/different.