I've listed a few tracks from youtube below so you can get an idea of what I'm looking for.
http://www.youtube.com/watch?v=NHjHQoxq9O0 (being 36 minutes, you may find it more worthwhile skipping around.)
And lastly, a more vocal song: https://soundcloud.com/kouji_iced/wo-ai-ni-hitomi-takahashi-x
I heard that the HE-400s were pretty lively but weren't the best in reproducing mids/highs, and the HD 650s were stellar in reproduction but were considered "boring".
Comfort is not an issue for me, I'm looking for the best performance for the price, and if it came down to it I think I'd go for HE-400s or HE-500s.
My next question is deciding on an Amp and DAC, I've heard that the Schiit Stack is good enough for the HE-500s, so I was leaning towards those. I'm planning to listen through my laptop, phone, and a piano keyboard sometimes.
My final question is whether I'll actually need a DAC, I feel like it will be unnecessary at this stage (as I'm barely messing with all this stuff), and I figured the headphones > amp > dac in terms of performance boost, so I was thinking going for the HE-500s and the Schiit Magni would suffice for the time being (it's a pretty large investment for me right now as I still have some student loans to pay off).
Thoughts and criticism are much appreciated, thanks!