Advice for ram memory

Hi all,

I have a GIGABYTE GA-H55M-USB3 LGA 1156 Intel H55 HDMI mainboard and wanna upgrade my 4gb DDR3 ram.

I am doubting about 8gb or 16gb. I checked the buy guide on tony mac but everything is DDR4 nowadays. Any advice what DDR3 will work in my mainboard and is recommended?
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128429]


Thanks in advance!