I picked up DS Extravance on a whim at Ulta one day and I fell in love with it when I put it on my nails. I used three coats to completely eliminate the visible nail line, but it applies wonderfully and dries pretty quickly. It's a nice purple-leaning-towards-pink holographic polish and it isn't as rare as some of the other DS polishes. And just for fun, DS Extravagace with China Glaze's Matte Magic topcoat.
DS Extravagance is from the OPI Designer Series of fall (?) 2008.