I normally shoot indoors with my SB-600 but as luck would have it, I was without my flash unit for an indoor function and had to utilize ambient lighting.
This shot is ISO 6400, and the grain doesn't really bother me as much as the colors. The High ISO seems to affect colors in a way that is not pleasing to me.
I used CNX2 to adjust the WB/exposure, removed the color noise, resized to 1600, exported to Tiff, then used Noiseware to apply NR and then exported to Jpg.
Again, I am ok with the small amount of grain, even the slight blur, but could someone show me how to get better colors out of this pic?
I couldn't download the RAW so I worked from your PP attempt which looks a bit too cool in the skintones for the woman in the foreground. She appears to be in different, darker and slightly cooler light than the OOF woman in the background.
I did the correction using Levels in CS5. In CS5 Levels the default highlight eye dropper value is 255.255.255, but by double clicking it the target value can be reset. I keep mine set to 250.250.250 the value of a solid white object.
So the basic color correction was simple: select the highlight eyedropper then click on the white part of her dress. Then to lighten it up I moved the middle slider in Levels from the default 1.0 setting to 1.2 which keeps the ends of the tonal scale the same but lightens the mid-tones.
