Get 1600mhz theyve already come out with ddr4 ram clocked at 2400mhz any ways ddr3 1600mhz is cheap already. Here is a good set.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820233144
Make sure your power plan is running in high performance mode here is an article on it.
http://www.tenforums.com/tutorials/2843-power-plan-settings-change-windows-10-a.html
Which should i get i plan on getting two of them and wall mounting them. i will be gaming on one and using the other for stuff like skype and monitoring spu and gpu temps. It will also come in handy for web browsing and video editing...