I finally decide to get the HD 598.  and I like it very much. 

thanks alot for the advice. Mshenay and KG Jag.  I'll sure try them out at my local headphone stores.

Not sure what sound signature I'm seeking.     But like the title says, I'm listening to alternative rock, pop, indie.  which is always a combination of male voice, bass, acoustic and electric guitars. 

Yes. I am ok with open cans.   Yes. it's onkyo     here is the specs: Power output：145 mW + 145 mW（32 Ω, 1 kHz, 10% THD, JEITA） 60 mW + 60 mW（300 Ω, 1 kHz, 10% THD, JEITA） 35 mW + 35 mW（600 Ω, 1 kHz, 10% THD, JEITA）

I've already bought a Onky dac-ha200 dac/amp.  Coming from Beats Studio. I'm willing to spend some $ to upgrade the current setup.  I've tried to download some FLAC files and already see some improvements.   I've tried Ultrasone 900, v-moda m100.  Both are way too much bass.   What should I...

thanks for the useful information. I'm going to try it out in a headphone store.

Over or On Ear Open Back Source is spotify premium   Does it hurt to get a highend headphones like Sennheiser HD800 or Beyerdynamics T1 to go with JDS C5D?   What's wrong with high impedance headphone to go with low impedance amp? Or is it overkill?   Any recommendation?