I'm really shooting for quiet here as I'm very sensitive to sound. Would prefer a motherboard that will fit into an Antec Sonata case (already have 3 machines in that case, and I love it). SLI is not a requirement. Also I'm probably going to need 600+ Watts. What's the quietest power supply in this range? Any thoughts?
Don't forget to analyze your actual computing requirements. It might be that two Kentsfield (single quad core) systems might be more effective (and less expernsive) than a single dual Harpertown setup.