For motherboard chipsets I feel the best solution is to use a big passive cooler than a smaller cooler with a small fan. Small fans don't last as long as bigger fans and tend to be more noisy. With a big passive cooler on the chipset you don't have to worry about a fan dying. Of course your case cooling should be good enough in order to use a passive heatsink on the chipset.
You seem to be very interested in computer cooling. Don't get too obsessed with it. I used to concern myself with cooling my computer in the best way possible and at one point had 18 fans in my case. Sure it cooled everything really well but the computer was awfully noisy. In my current computer I only have fans on the CPU heatsink, the one in the power supply and one exhaust fan on the back of the case. My video card has a big passive cooler and I thermal epoxied a old cut down Socket 7 heatsink on the northbridge chipset. I try to go with as few fans as possible because I got tired of the noise.
Cricket