An advice please...

Hi,
I have a system with Asus Rampage Extreme, Intel Core Quad9650 3.00GHz, Ati Radeon 4870 x2 and Windows 7 64bit. I want to upgrade my RAM from 4GB to 8 GB. Actually I have (4x1) KVR1333D3N9/1G Kingston 1GB 1333MHz DDR3 Non-ECC CL9 DIMM.
Please can you advice me to choice one of the following memory:

Model Brand CORSAIR Series DOMINATOR Model CMP4GX3M2A1600C8 Type 240-Pin DDR3 SDRAM Tech Spec Capacity 4GB (2 x 2GB) Speed DDR3 1600 (PC3 12800) Cas Latency 8 Timing 8-8-8-24 Voltage 1.65V

Model Brand Kingston KHX1600C9AD3K2/4G 1600MHz DDR3 Non-ECC CL9 DIMM (Kit of 2) Standard 256M X 64 Non-ECC 1600MHz 240-pin Unbuffered DIMM (DDR3, 1.65V, CL9, FBGA, Gold)

Model Brand Kingston KVR1333D3N9K2/4G
4GB 1333MHz DDR3 Non-ECC CL9 DIMM (Kit of 2)
Standard 256M X 64 Non-ECC 1333MHz 240-pin Unbuffered DIMM (DDR3, 1.5V, CL9, FBGA, Gold) (Datasheet)

Model Brand Kingston KVR1066D3N7K2/4G
4GB 1066MHz DDR3 Non-ECC CL7 DIMM (Kit of 2) Standard 256M X 64 Non-ECC 1066MHz 240-pin Unbuffered DIMM (DDR3, 1.5V, CL7, FBGA, Gold)

Thanks in advance