Just follow the rit chart and you should get the colors pretty clean.
Two of my favorites are Bright navy and Cherry red.
Here's two examples that I've done.
Ive mixed a few colors for one time use but it's not too often. Chuck has some really sweet color manipulation things he's done.
I do a lot of blacks, but for my tournament donations I'm aiming to donate less discs per tourney, but on the discs I dye make the dyes more complex with more colors. I haven't really done much colors in the last half year and am aiming to change that