For your CPU just pick the Scythe Fuma, if it's available to you. The problem with Scythe Fuma is that they aren't as widely available as Noctua, and the crappy fans, but Fuma Heatsink is solid. For example in Australia, we have zero stores carry Scythe Fuma. Importing it from Japan put it pretty close to NH-D15S in term of price ($99 vs $104) so there's no sense picking the Fuma, at least for Australian.
Actually here in Central Europe the Fuma is 50$ and the Noctua D15S is 100$.