depends on what you want to keep. soft corals and LPS only you can get buy with VHO or PC. Probably look to have close to 400w total.
If you want to keep clams and SPS corals then you are better off with Metal Malide lighting with actinic supplemation in either PC or VHO.
Personally I would recomend 2 250w MH 10,000k with between 220 - 440 VHO actinics.