I got an A8N -SLI deluxe mobo. Im going to install it myself, anyways, i just got a quesiton, there are two types of standoff screws : brass and plastic, which one's better or both are required? If i just use brass, can i just screw in the motherboard onto the brass standoff with a regular screw and a non-metal ring underneath the screw or do i really have to use the plsatic standoff. And is there any other things i should know regarding installing motherboards? Thanks!