From your 3 choices I'd go with the 1600 @ CL8 Would yeald about the bset performance over all.
Over all your 1st and 2nd choice would yield about the same performance. Some apps prefer the higher speed, then others like the low CL ( read a review that indicated this), Reading between the lines it prefered CL 8 or lower.
This is what I'm getting, 1600 @ CL7 @ 1.6 V - Low CL and also slightly LOWER voltagehttp://www.newegg.com/Product/Product.aspx?Item=N82E16820231401
Curenttly using ripjaws but 4 x 2 Gig / CL7, @ 1.60 Volts, works great!