Yes, my intention is to build a 6 GPU Miner (and I'm going to use win)... maybe I found 6 RX 580 at an accettable price (the 4gb version, I know 8gb is better, but I can't find them at the moment).

Honestly I would like to save money with mobo etc... a cheap Celeron maybe would be ok... no?

How many w do I need? A 1000w can be ok? Maybe better 1200w?