Sigma 19 still remains my favourite for overall beauty. I can understand why OSC hung around for so long. It's also a great nexus system with all kinds of coloured ships criss crossing from different entries and exits (as do the other Sigmas but not at 19's scale). Two different coloured stars, two different coloured nebulae, a gem of a planet as well as two wicked named planets hiding in a nebula, the golden coloured rock belt, the lightning flashes within the clouds, it's all beautiful.