Heatsink To Heatpipe?
 

I have a pentium 4 1.7ghz and a nice aluminum thermaltake indigo orb:
thermaltake's spec page
http://www.thermaltake.com/images/co...oDimension.gifhttp://www.thermaltake.com/images/co...1053/a1053.jpg

so i want to make a combination of watercooled/heatpipe technology to cool my beast, heres a paint of the the holes drilled so far (attached), the fan is gone and the bottom has been lapped.

i plan on having my friend take some small aluminum piping and weilding it into the holes drilled and then having them go though a small radiator and back down into the heatsink all sealed.
But i dont have 1) money 2) space to put in a pump or a res, hence heatpipe.
So i ask::
1) what liquid has a low enough boiling point to be use instead of water in a heatpipe? (including refrigerants)

thanks, tux

picture
 

the blue holes go though the heatsink, and intersect with the white holes which just go down to the base of the heatsink.

all the holes are 1/4" in diameter

Alcohol is one common fluid, though water will work too. Its not the boiling point that matters, but rather the vapor pressure at operateing temperature since you'll be vacumming out the air in the pipe.

At least thats how i figure. I never actually built a heatpipe.

well i cant vacuum seal the tube..
 

well i cant vacuum seal the tube..
so i have to use a liquid that has a lower boiling point then water at regular pressure i have access to many different refrigerants but i dont know any properties about them. i was hoping someone here could give me a little insight into the chemical properties of different refrigurants..

Thanks,
Tux