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I haven't tried PS CS6, but the noise reduction in CS5 has never impressed me. I used Topaz DeNoise5, but I suspect there are other options for noise removal as good or better. However, for this one at this size, the Reduce Noise function at 10, 20, 100, 13 (everything max'ed) should be almost adequate. In the following example, starting from your last posted image, note PS CS5 leaves more color noise and a little more luminance noise that the Topaz output. Applying it twice is better, but removes more wave detail. The second example shows it applied twice with the same vib/sat reduction as my previous post suggestion, but notice it will requite more vib/sat reduction to match my previous post's suggestion example because the color noise reduction isn't a large with the Reduce Noise CS5 function. This is why I use a third-party noise reduction program. CS6 my be better, but I haven't tried it.
PS CS5 Reduce Noise at 10, 20, 100, 13
Reduce Noise applied twice at 10, 20, 100, 13 & same vib/sat reduction as suggetsde