try using a blue orb HSF and powerstrip 3.
ramsinks are deffo the way to go by the looks of things.
i would prolly chop up a copper cpu sink with me dremel rather than buy ramsinks.
to apply a ram sink use arctic silver compound and epoxy with hardener...1 part hardener to 1 part epoxy to 1 part compound.
you should think about modding your case to accomodate a fan in the side, directly over the card.
experiment with detonators too. some early versions may be better for your card than the latest version.
peace,
Franco