MoMan,
Like the others say, it'll cost you but if you want to keep nice corals MH's are a nice way to go. I would also suggest the dual 250's, these will allow you to keep everything that you could ever want, and the difference in price between 175w and 250w are minimal.
Still, the overall set-up and system will cost a pretty penny. I would keep your pc system for actinic supplementation, since selling them would not be huge boost to the pocket book.
Good luck,
Rob
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