Hello, I was going to buy 470s but I can't find any in stock.

Is it good idea to buy 570/580 instead? Is there still consistent problems with 6 cards at same time? I heard people were having hard time making it work but has it been fixed now? Would I risk spending a lot of time trying to make them all work or has it been easily fixed by now? Sorry for not reading whole thread.

Also, would 1200W PSU be enough for 6 470s?