Digital Painting Palette for Gamut mapping

I have been investigating digital painting lately, and was trying to do some colour studies.

Painting in oils I have my main palette plus a palette of mixers arranged approximately around the colour wheel (biased towards the orange side as this is the area I have been working in, with one or two tints of each for easier mixing.  I occured to me to do the same for digital studies so that I am developing greater clarity about the colours I am observing.

This is from the middle (more neutral) field of a colour wheel.  I am using the photoshop terms of saturation rather than chroma and brightness rather than value as I believe these are technically a bit different, and also for clarity for anyone who wants to use it for digital painting using the HSB colour picker.

The background is a 50% brightness 0% saturation grey.