I like Cerulean blue, but I don't know if it's still available. I also like Cerise Flambe & metallic red raisin for red. Green is kind of hard. Coastal doesn't have a true green. The closest they come I think is majestic green. I use black mica rather than the black dye, but I use white dye much more often than pearl white. The dyes you can buy where you buy the resin.
One thing you'll discover, is that the different colors set at different times. Black & antique silver set fast. Most greens and blues take longer. The exception seems to be cerulean blue. And some colors, like antique silver, need to be mixed with other colors to get the effect you want. For example, I use white pearl with a touch of antique silver to get a bright silver. Antique silver is almost battleship grey but with a pearl effect.
Most of the golds & browns work well, so pick some that you like & go from there.
And purple seems to sell well, but they discontinued chameleon violet, and I don't know what they sell that would replace it.
Frankly, it seems that the more I go to Coastal, the more colors they have dropped. At least colors that I use.