If you're not overclocking try to get a mobo with no fan and just a heatink. why? no moving parts = less things to fail on ya = longer lifespan of technology
if you are overclocking, well, then you WANT a fan because you're pumping more voltage into the chipset therefore you want active cooling to keep it low on the temps.
Might want a fan too if you know you're gonna be operating in a hot/humid environment.