@BoomR, my friend.. just found some very short time to fly over the recent posts along this thread.. therefore, just a few comments, suggestions from my site until I will disappear again until beginning of next year.
Go for the Sapphire Nitro+ Vega 64 if you want to use airflow cooling although there is also a possibility for custom water blocking (aliexpress) of this GPU. The Sapphire Nitro+ Vega 64 might be best controllable in terms of fan speed und noise level. There is a windows app you can download from their web site to change led colour or to switch off the onboard GPU leds completely. If you opt for custom water blocking, the MSI Vega 64 air boost also would be a perfect choice (EK custom water blocking available). No idea about its airflow fan behaviour though. The Gigabyte Vega 64 does have an optimal DP (3x) and HDMI (3x) port configuration, fan speed control and noise level regulation turned out to be tricky though. There is no option for custom water blocking of the latter GPU. In general I would recommend custom water blocking for all Vegas, if possible.
Hope this helps in taking your decisions.
Happy new year to all of you and until soon,
KGP