I was looking for a blush recently to complement a mauve-toned rosy lipstick, and NARS Mata Hari powder blush turned out to be the perfect solution. It's a cool toned rose with blue/purple undertones, no shimmer and absolutely no warmth/brown tones.
Compared with Gaiety (left). Gaiety is a similar tone, but lighter.
I purchased this from SpaceNK - I do try to buy NARS here for the N.Dulge points, but I've noticed their selection of NARS products seem to be getting smaller in some stores. NARS blush costs £21 in the UK.