Actually I'd like to avoid anything with Sony on it, IMHO you pay too much for what you get when it comes to Sony.
"In my opinion, different headphones sound best with different types of music. So your musical tastes become a factor. "
Pretty much across the genres, eclectic my tastes are. Doesn't really help, but I tend to lean towards softer pop/alternative
"Value of price. What is too expensive? The laws of diminishing returns come into play. The Sennheiser Orpheus runs $11,000+/- while the Sony MDR-V6's can be had for under $80.00. Will you find $10,920.00 more enjoyment out of the Orpheus? "
Sweet Jesus, there are headphones that cost more than my Toyota Camry. I never knew. How many people OWN one of these things? And what do they look like? Is some rare Earth metal part of their design??? Dear God. Well I should have said this earlier, but I'm in Australia, so basically times everything x 2
You can get a car brand new here for $19,999 AUD. Anyhow I'd put my budget around $100 USD
"How will the headphones be amplified? Portable CDP, intergrated amp, or dedicated headphone amp. If a dedicated headphone amp, solid state or tubes? "
Primarily my headphones will be powered by an old Diamond mx300 soundcard, and infrequently a hi-fi system. I have no idea what a portable CDP or intergrated amp is, so I think I'll just run over to the links you kindly posted and do a bit of reading.
I'm also interested in getting my gf a pair of headphones, she's a vocalist in a band and her 18th is coming up in September, and if headphones really do cost as much as they seem to, I'm glad I got this much of a headstart