I've played with the ferrofluid you spoke of its actually pretty fun. Its like magnetic water. If you hold a magent to the container the water will flow onto the side of the bottle. I never checked the thermal conductivity of it.
Flourinert is only necessary for a submerged cooling solution, to spend the money for it and run it through tubing is a waste.
Best cooling is water. The CBA(Cost Benefit Analysis) shows water is clearly the most logical choice. Anything else costs way too much and it barely better. Plus a water leak may kill your comp but won't harm you. Playing with some of this other stuff prolly isn't very good for ya.
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