Intel 13&14th gen are trash that still have reports of instability. Intel keeps saying they fixed it but i wouldn't risk it.
You either go 12th gen and older or skip to the ultra 200s
I would go as low as the 12500 since it uses the same igpu as the 14900k.
Keep in mind that you would be better off making sure that the client side doesn't need transcoding imo
Go with a smaller, cheaper boot drive since hexos uses less than 16gb of data and you cannot access the rest of the unused storage.
Minimum 2 drives mirrorred is required for a storage pool at this time. However if you make a 3 drive storage pool, the ability to expand your pool later with more drives gets enabled.