How does one go about shopping for a headphone amp? What are the specs you look for? How does one determine the needs of their headphone ? How do you identify amps that meet those needs through the amp specs?

Stax SR-007MK2 what are some considerations for amps to drive these? Recommendations and why?

THAT is my budget for a headphone. 90% classical music. over ear, closed. Thoughts?

I'd like to put together a headphone system around the Woo Audio WA6 SET Class A Headphone Amplifier. Can someone recommend a SACD/CD transport and DAC to compliment? 

so what is the deal with their pm1 and pm2 headphones?  what i mean is how do they compare to others in the market at similar price ponts? they don't have a great look, how is the sound and quality? what are other headphones that might be better at these price points?   i have an oppo ha-1...