Does it have to be brand new kitteh? I think you are piecing this kit together so maybe you can keep your eyes peeled for a used HSF. You might be able to find someone moving from high end air > water and just looking to clear out space so possiblee a good deal to be found/had?
IIRC the Vendettas were similar to the Xigmateks of the time, all of which were excellent coolers for the $$$
Scythe makes some pretty good coolers for less than $50, Zalman seems to have greatly reduced their prices as well, in my area/s anyways...