I'm going to have a TDX block cooling a Athlon X2 4200+ and an MCW55 cooling a 6800 GT. I plan to use the swiftech mcp350 pump. I want a quiet system so I want to use a low CFM fan. Also, my radiator will be mounted externally. Is the black ice pro my best bet? Would the BIX perform any better with a panaflo L1A 120mm fan or a similar low speed fan?