Most folks, the Corsair Vengeance is a solid choice the downside is running them > Rated i.e. >DDR3-1600 but @ Rated they're rock solid:
Corsair Vengeance 16GB (4 x 4GB) DDR3 1600 Model CMZ16GX3M4A1600C9 - http://www.newegg.com/Product/Product.aspx?Item=N82E16820233143
If you plan to OC both the CPU and RAM >Rated: Corsair Dominator (including GT), G.SKILL Trident X Series, or Mushkin Enhanced Redline. The Corsair Dominator series are all hand picked (expensive) IC's and easily OC.