beyond benchmarking, most RAM 1600 or above gives no noticeable difference in performance. So just find the one you like the look and price of. Then google a few reviews to make sure there's no glaring issues and go for it.
When I was buying RAM, Gskill Ares 2133 was only $5 more than stock 1600 RAM. It looked nice and was low profile (so as not to clash with the CPU cooler), so I got that. But it makes no difference if I clock it to 1600 or 2400.