I own seven seamless colors -- white, black, sky blue, orange, light purple, thunder grey and yellow. But 80% of my shooting on seamless is with white, black and blue. White is perfect for fashion shoots and if you keep your model lights off the background, you can turn the white seamless a rich warm grey. Blue is a great color for shooting swimsuits, especially if it's a sky blue. Blue is also great when you want to knock out the background and replace it with an actualy sky. Black is one of my favorite colors because it can either be used as a solid black background (great for one liught b&w images) ... or you can turn the black into almost any color you want by lighting it a strobe or two and using colored gels on your strobes.
Suffice to say ... you made three great choices.