What memory should I buy?

[James165]

I am planning on building a gaming PC with a budget of around $900, I have chosen the Nvidia GeForce GTX 560 Ti graphics card, Intel Core i5-2500K processor and the MSI P67A-GD55 motherboard. I am almost ready to purchase the components, I just have to choose which memory I am going to buy. Which of the below memory should I buy? Keeping in mind value for money and compatibility to the system I'm building, specifically the motherboard. I am quite confident all of the memory listed below is compatible with my motherboard but it would be helpful if you double checked. Thanks in advance.

G.Skill 4GB (2x 2GB) F3-10666CL7D-4GBRH
http://tinyurl.com/7hobrb3

G.Skill 4GB (2x 2GB) F3-10666CL8D-4GBECO
http://tinyurl.com/84n9see

G.Skill 4GB (2 x 2GB) F3-10666CL8D-4GBXM
http://tinyurl.com/87mel2q

Corsair Vengeance 8GB (2x 4GB) CMZ8GX3M2A1600C9B
http://tinyurl.com/7ud85bq

[Transfusion]

If you can justify your need for 8GB RAM (i.e. going to open multiple Photoshop windows, use a DAW with various VSTs, run a few virtual machines or two) then I would say go for the 8GB as 2 sets of 4 GB G.Skill RAM would already cost $69.7, but in this link (  http://www.mwave.com.au/sku-37140863-Corsair_Vengeance_8GB%282x_4GB%29_Dual_Channel_DDR3_Memory_Kit_PC3_12800_1600MHz_240 ) an 8GB set only costs $55. You wouldn't have to upgrade in the future anymore.
I wouldn't buy any of the "Eco" or low CL response time memory kits- a few nanoseconds or a fraction of a volt decrease will make virtually no difference in your computing.

[James165]

Well  I probably wont need the 8GB so which of the other ones would you suggest?

[Transfusion]

This one:   http://www.techbuy.com.au/p/163332/MEMORY_MEMORY_DDR-3_RAM/G.Skill/F3-10666CL8D-4GBXM.asp

I wouldn't buy any of the "Eco" or low CL response time memory kits- a few nanoseconds or a fraction of a volt decrease will make virtually no difference in your computing.

[James165]

What about this?

http://www.techbuy.com.au/product.asp?prodId=125858&catId=MEMORY&parentId=MEMORY_MEMORY_DDR-3_RAM

[Transfusion]

If you are willing to pay 3 more bucks for your programs to load a few miliseconds faster... go ahead.