The most current best selling blush at SEPHORA is "ORGASM" by NARS. It's another pinky-peach color but with some gold shimmer added into the mix. They also come in sticks which I think is super convenient. Here is a picture of Leighton Meester sporting "SUPER ORGASM". According to the Nars makeup artist, he used a combination of NARS The Multiple Bronzer in Tuomota, The Multiple in Maldive, topped off with the new Nars Super Orgasm.
An old time favorite of mine from MAC is "PINK SWOON". It's not as pigmented because it's more of a sheer tone blush but with a few strokes of application, it gives you that pink doll faced look! Super cute.
I would say the one I've been using the most is "DOLLYMIX". I absolutely love this one. Especially after a long day where I feel like my face looks tired and washed out. It immediately brings color back onto my face. It is a lot stronger than "PINK SWOON" so you don't need as much when you put it on.
Another cool product to try is the Maybelline "Dream Bouncy" blushes! They don't last as long as the MAC blushes but I think they are a lot of fun and you can try a variety of colors because they are so much cheaper.