"but it's too tall for my case"
Even the original Vendetta? It's only about 5.2" according to specs, that's 0.8" of space, not much but if there really is 6" of room (not just 6" from one side of the case to another) then it should fit. I'm looking into using one of them when I get a Phenom X3 720BE. My case had to be modded for it, but if I can keep it cool it's worth it.

Would be nice to know the exact size of the HS though, from very bottom to very tip and from side-side, not sure actual specs include every little bit of it. (anyone who owns one know?)
Also, just checked, the "Arctic Cooling Freezer" is actually bigger in all then 1 aspect then the Vendetta 1. It's 3mm (not exactly a big difference) bigger in one way (not sure which, e-bay doesn't say WxDxH)