Save your money.
Being a VR enthusiast is like chasing the dragon. It's both worse and better then audio. It's worse because everything is in a state of flux and many things are obsolete every two years. It's better because there actually are massive jumps in performance and abilities. We are still likely 5 years away from reaching systems that are powerful enough to drive headsets that don't exist yet with more field of view, more resolution and higher frame rates and eventually in smaller lighter form factors.
Speaking of audio, I've got the Sure 215 earbuds and the HD 569 over head phones and I'll likely try to 3D print something to support Index off ear speakers.
The 215 earbuds are more for live music mixing and have isolation, but are light and you forget you are wearing them. The HD 569's are still efficient enough to run off the Aero's jack without amplification and they do sound better then the earbuds, but they aren't audiophile quality and they will get hot if I wear them in a sim. However this is more like having a subwoofer for movie effects rather than for sound accuracy, so these headphones may be fine for in game use. I won't know until the headset gets here.
Anyway find a toilet and pour money into it