Hey Kram, I dont know if you ever got an answer to the stocking question for the hex tank, The lighting you had in mind would probably work OK, but most people will find that a hex, even an 85 it too tall, and needs the stronger light, and that the footprint of the tank is not optimal for a reef tank, you wind up having to go vertical, a rectangle has more space in it for aquascaping and the like. Also mixing coral type can result in conflicts between, say , SPS(hi light,hi flow) and LPS or soft corals (lower light and more lagoonal)
If you already have the tank you might consider setting it up for a certain type of coral and then get one or two spectacular pieces as a a center piece. i.e. a big Yellow Fiji toadstoll, or a trphy hammer,frog,torch or similar coral, HTH