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8GB DDR3 1866 MHz or 16GB DDR3 1600 MHz?

You star to get diminishing returns after 1600. Same as going over 8 Gb capacity for games. However, the 16 Gb will benefit more in the long run if you are doing multiple tasks at once such as having a couple of web browsers open watching youtube on one and gaming in another. If you run any virtual machines this can also be a great addition. There is not a super discernible difference between 1600 and 1866.

I would recommend G. Skills Ripjaws X memory. Looks good, functions good, runs at listed speeds, rock solid. I have had to deal with their customer service once because of a DOA stick and it was a great experience.