Lord Nemesis, I think the Noctua coolers are quite good. Cannot commit about flaking (probably we can wait for some Mumbaiker to tell). The fans do the job decent and the NT1 TIM is also decent. Not do dense and spreads well. Correct, they are built for silent performance but they also deliver the cooling which is required. Anyways, you are out of the LGA775 days and the new SNB run cooler and OC much better...!
Honestly no point in replacing with a high flow fan 'as of now'. Try the HSF with the bundled fans (if Noctua) and see how far you can get.