I'm between an NC15 and NC20, so I'm pretty pale too. My favorite NARS blushes are Desire (matte, looks scary in the pan, but applied with a light hand is a soft pink flush), Gilda (matte pinkish peach), Sin (shimmery berry), and Outlaw (shimmery rose).
Use a soft, fluffy blush brush (like the mac skunk brush) rather than a dense brush to get a really light application. Lightly sweep your brush onto the blush one time, and then whisk the blush lightly against your skin, since the blushes are so pigmented.