My 180 is set up as a peninsula. I run 2 6' VHO's and 1 175W 14K MH in the center. This allows me to grow SPS in the middle third and softies/deeper water species on the ends. Because of the VHO's stretching the whole length and the 14K MH, I don't get too much of a perceived difference in light brightness or color. As for lamps, I bounce around between a 454/75.25 or Actinic/454 combination, depending on my mood. The 14k MH is a constant.
As for species selection, you may steer away from toadstools and lobophyton (devil's hand) because these IME secrete more toxins. I've grown finger leathers to huge colonies without hurting the SPS.