PimpRig has one of those fancy "FLOWER" type HSF units for you. See what they thought of the Zalman 3000 Copper HSF. here's a snip:
"While this is supposed to be a fairly quiet HSF, which it is, anybody can see by the design of this bad boy that Zalman put their all into making this noise / performance ratio the best for the end user. The 80mm fan maxes at 38CFM, and in silent mode it is 28.0 CFM."