I've only recently become a blush user in the past year but I have a few faves..
MACs spaced out, an LE but its gorgeous, no need for a back up tho, its a summer blush lol. And brit wit creme.. The most perfect rosy color.
Bare Minerals, I love first class for a pink, laughter matches peachier tones like spaced out, and hint for a mauve or posh which isn't out anymore.. And I like to mix a radiance with them for a glow..
And lastly a color from a product line sold on hsn called serious skin care.. Their blush called guava is fantastic, although I'm not sure its still available, yet I haven't needed to restock in bit either..