I'm using a Thermaltake Toughpower 750W and an EK Supreme HF Full Copper waterblock. Still waiting for my board and proc to return from RMA after 5 weeks.
Also made a complaint to ASUS as I suspect there is flaw in some boards but initially they came back to me talking about the "Sandy Bridge" problem which either shows the support person doesn't have a clue or they were trying to shaft me. Either way, my faith in ASUS has dropped a lot.