The noctua nh-d15!!!
Which seems ot be just a slightly imprved version of the d14. I've got my d14 from ebay for arround half the price - it was marked as used but sold by and official retailer and when ive got the cooler it was in an originally sealed box. So i just saved arround 50$.
So if you're pplaning on buying it have a look at ebay..