I'm trying to avoid earth colors as much as possible because so many of them tend to sink in, and I'm finding that a more chromatic palette is more pleasing to my eye. I've been experimenting with these:
- Flake White Hue (Gamblin or W&N, this is just a tad warmer than Titanium, but Titanium is doable too)
- Cad Yellow
- Indian yellow
- Cad Red (I'm gradually trying to go cad free so I sometimes use Dan Smith Cad Scarlet Hue)
- Quinacridone Red
- Cobalt Teal (or Pthalo Turquoise)
- Ultramarine Blue
I also find Perylene Maroon to be a surprisingly adaptable paint. It's a gorgeous dark, rich and transparent paint which seems to work well in mixtures as a substitute for red leaning earths, and so might be very useful in your case.
It's a palette that I find can go a long way. When it's necessary, I can swap out some of the colors for other ones, if I might need a more transparent something. Or if, for instance, I need a yellow that leans green I'll use zinc yellow or Nickel Titianate Yellow.