My friend is looking to build a new pc and his birthday is coming up so I was thinking of picking up a motherboard for him to get him started. He is partial to asus and intel and the pc will be used mainly for gaming. I know he wants to have at least 2 vid cards using crossfire and maybe a third. I don't if he wants a sandy bridge or just a i7-9** and I don't know the dif. He also would like usb 3.0 and at least 4 pcie 2.0 slots. I have a $500 budget (Canadian). Any suggestions would be great, Thanks