Curt, this is going to be really bright lighting. Some things you could do:
1) Set up the rock work so that it is "staggered" vertically with overhangs and stuff (lots of shade areas). You can put your SPS or clams or whatever higher up closer to the light. This would also allow you to use a smaller light (like 100w -- look up metal halides for nanos, they make 'em).
2) Provide a PVC tube for your peacock that is as long as is reasonable within the tank (aim for, say, 16-18"). Use a gray or black tube -- look in the electrical section of your local hardware store and get a curved 90 degree electrical "elbow"; cut to fit.
The deep sand bed with egg-crate would work fine.
As for locating a peacock, I didn't have much trouble when I set my mind to it. I called a lot of wholesalers and large fish stores in Los Angeles and San Diego (you can try local ones -- Miami?) and left my name; I had a few hits pretty quickly. You can find them online occasionally but insist on a picture -- or talk to a human and have them describe it to you. Get the species in writing -- this forms a binding contract.
Have fun,
Dan