So i'm running the first set of a prototype racing coilover from Unplugged. They have stiffer springs than the normal coilovers they sell, but that's what i want for track use. They also have an external reservoir and additional adjustability.
I was a little scared that they would be too harsh/stiff since this is still my daily driver, but its not bad at all. The body roll has been substantially reduced and gives much more confidence during hard cornering.
Some more info and pics in this thread:
UP vs MPP Coilover