Robby, I'm curious about your current light setup. You've got 20K MH bulbs with actinic supplementation. Did the setup come that way? I'd think you'd get very little growth without a source of whiter light. Generally the blue is for looks, but the yellow and white are more important for growth. Balance between those is key.
I had a 65g SPS tank, which I ran with three 175 MH. I got good growth from middle to top of the tank.
I wouldn't recommend anyone rethinking their lighting to go with PCs. They're the least efficient reef lighting. If you want to use less electric, and keep softies and LPS, get T5s. Personally I'd stick with what you have. If you change the MH to 10K, then you will have much more light, and could keep SPS if you wanted to.