I have a pair of Grado SR-60i. Since I've never put on a pair of headphones that costs more, I find them very nice sounding. They are kind of 'get my foot in the door' headphones into the higher fidelity sounding headphones.
My question is, how much more do I have to spend on another pair that I will hear significant improvement in sound quality? I mean it's pretty clear that there are $500 headphones and higher that people can buy but at what point is the bottleneck on the MP3 player and not the headphones?
For example, if I get a pair of Denon AHD2000, I am sure I can hear the difference but do I have to pay that much more to get better sound based on the "diminishing returns rule"? Of coursem usuallt you get what you paid for but I am sure at some point, it's not the headphones anymore...it's the $80 MP3 player or the $60 amp.