this
http://www.cclonline.com/product/104680/F3-17000CL11D-8GBXL/Desktop-Memory/G-Skill-8GMB-2-x-4GB-Memory-Kit-DDR3/RAM0876/
or this
http://www.cclonline.com/product/95188/CMX8GX3M2A1600C11/Desktop-Memory/Corsair-XMS3-8GB-2-x-4GB-Memory-Kit/RAM0773/
OR FINALLY THIS (Its 4gb but i will buy 2)
http://www.cclonline.com/product/76559/KHX1600C9D3/4G/Desktop-Memory/Kingston-HyperX-4GB-1x4GB-Memory-Module-1600MHz-DDR3/RAM0544/
http://www.cclonline.com/product/104680/F3-17000CL11D-8GBXL/Desktop-Memory/G-Skill-8GMB-2-x-4GB-Memory-Kit-DDR3/RAM0876/
or this
http://www.cclonline.com/product/95188/CMX8GX3M2A1600C11/Desktop-Memory/Corsair-XMS3-8GB-2-x-4GB-Memory-Kit/RAM0773/
OR FINALLY THIS (Its 4gb but i will buy 2)
http://www.cclonline.com/product/76559/KHX1600C9D3/4G/Desktop-Memory/Kingston-HyperX-4GB-1x4GB-Memory-Module-1600MHz-DDR3/RAM0544/