I like the following:
Magenta-Its color looks just as the name implies; I've successfully worn it with Rocking Chick, Stiletto, Pomposity, and Girl About Town.
Cherry-Bright true(but not orange-y) red; goes with just about any red: Russian Red, Ruby Woo, Powerhouse, Glam.
Beet-pinky/purply red; goes with Girl About Town, Rebel, or Glam
These are the only MAC ones I own, but I love them dearly!