Mouse, you seem to take for granted that the Zalman user is "giving up" performance in favor of less noise- an assumption that has not held true in my experience.
Careful (and admittedly, time consuming) tinkering with the rest of the case's cooling paths can elevate the performance of the 7000 series (I have no experience yet with the 7700) to that of any HSF unit that I've tried.
Obviously, the "bigger hammer" approach taken by Thermalright is quicker and easier, but that doesn't necessarily make it automatically better.