I did my first hackintosh few days ago just for the learning experience, I have normal Macs otherwise. It does have a problem with flickering screen; I suspect it is due to 10-bits per pixel that I cannot switch from and the cheap HDMI2 cable used.

Wrt ESXI - are you aware, that with ESXI you will lose local console (and all the GPU-goodness)? After ESXI boots, it has only text-mode notice, how to connect remotely and that's it. You will be stuck with remote access. For things like build machine or test-runner, that's fine, but if you want to run something interactive... well, let us know about the experience ;)