Seeking spectacular sound setup

Greetings, you lovely bunch!

I am in the process of building myself a new funmachine. Unfortunately, I have stalled at the sound setup. Through extensive research, I have established that the following criteria are the most recommendable in order to achieve the best overall sound experience:
  • Avoid headsets (headphones with microphones)
  • Avoid wireless
  • Avoid USB
  • Only stereo headphones (I.e. one speaker per ear)
  • Open cup for sound quality (I sit in a quiet environment)
The machine will be used mainly for entertainment purposes – being gaming, video watching, and music listening (in order of importance).

I do not consider myself an audiophile per se – I do, however, value a great atmospheric feeling, accurate 3D positioning, and comfort.

I already plan on getting the Gigabyte GA-Z87X-UD4H motherboard. Will its onboard sound (Realtek ALC898) cover my wishes when paired with some good headphones – or should I get a soundcard? And what about an amplifier, a DAC etc.?

Originally, I considered getting the Sennheiser HD 650 as it has garnered much critical acclaim. Unfortunately, momomo6789 wasn’t impressed with its sound stage.

Despite my highest efforts, this leaves me fairly puzzled and in need of your kind help: Which sound setup compliments my computer experience the most without being overkill?

I have a generous budget. All response is, of course, greatly appreciated.
 
"I already plan on getting the Gigabyte GA-Z87X-UD4H motherboard. Will its onboard sound (Realtek ALC898) cover my wishes when paired with some good headphones – or should I get a soundcard? And what about an amplifier, a DAC etc.?" You won't need a sound card, just headphones or a low cost wired 2 speaker+ powered subwoofer
 
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