You might want to checkout
my purchase thread for reference.
in my setup, I don't suggest
1. Corsair H100i
2. Corsair AX860i
3. NZXT Phantom 820
4. Creative Soundblaster Z
reason being, corsair i series is useless. the drivers are a joke and there is no use spending extra on the
i stuff. instead I would suggest Corsair AX860 or better. Since you are planning for the water cooling you wont need the H100i.
About the NZXT phantom, since the smart fan control on asus boards is really awesome, the phantoms to manual control becomes useless. other than that its a pretty big case with big as$ fans.
Though the sound is awesome Creative's drivers+software are joke.
dont buy skull candy or Turtle beach headsets. I have them both and if you put on Sennheiser HD598 or similar, you will never like them for the audio quality or the comfort.
overclocking is really a big hassle and I would not suggest overclocking if you are not really serious. so, try avoiding open loop water cooling if you dont want to overclock.