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#11
What CPU/Motherboard are you looking at? If I were you, I would go with a 2x8GB kit, so in the future you would have the option of adding another 2x8GB kit IF you saw you were bumping up against the 16GB you currently have. Also, get something fairly common so 6-8 months down the road you can get another kit with the same timings and frequency if need be.
Here is what I would go with:
Corsair Vengeance 16GB
or
G.Skill Ripjaw X Series 16GB
You could go with faster RAM if you think you need it, but 1600MHz is fine for 99.9% of people.