A question on RAM choice and compatability

[iholly]

Anyone have any opinion on which RAM would be best? I want to play FO3, Oblivion, Bioshock, Mass Effect etc. on good settings on a 21 inch screen. Does it really matter between the RAM?

I can't find my motherboard on the OCZ compatibility checker so I'm worried.

Here is my motherboard:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128392

Here is my first choice but I'm not sure my mobo will do 1600
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227297

A downgrade but still ok?
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148227

(The heat sinks look HUGE, worries me)
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227293


Which is more important Speed or CAS timing or what?

Notes:

I am using a Phenom II 945 and a gfx 275.


Thank You,

 

[o1die]

Amazon.com has ocz gold tripple 3x2gb 10666 1333 ddr3 for $67.09 shipped, which will give you a spare stick in case one goes bad. Of the 2 above, the crucial at $63 will run fine.