Do you plan on high overclock on your I7, and how much do you want to spend. The reason I say this is for a mild oc, there may only be a few degrees diff between a good HSF and the Best, but the "Best" may be considerably more expensive.
I can vouch for the Noctua that RetiredChief pointed to. If OC'ing, it holds its own with everything ATM except the thermalright IXF-14... And that sucker is huge, probably very expensive as well as it comes with no included bracket or fans. The Noctua has everything included including two of some of the quitest fans out there.
Running 8 prime95 sessions, on mine, I get a 4c temp rise measured on realtemp.