I think the problem with water may be that it has an insanely high boiling point! I'm pretty sure that the boiling point is the lowest temperature your system can be after stabilizing. Yeah yeah, the vacuum thing, but do you really want to deal with that much vacuum? Why bother with actively doing it? That will be a bit of a hassle, to say the least, and I doubt it would turn up much. The highest I've seen a manufacturer reporting is 200,000W/m^2k, but that was for a flat plate. I think that a well done (heat pipes are in their relative infancy, in my opinion) heat pipe will offer all the performance we'll ever need.
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