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I (as well as a few other members) have done some fairly intense planning of this type of system over the last couple of years--have you done a search for related threads?
Also, in most tropical areas on a clear day (and good vis) you'd still be using halides over a tank to replicate the light at 60-100 ft. of water--it's really not as "deep" as we think it is.
And getting fish and organisms from even deeper isn't really that difficult--a vast majority of the ones we already keep in brightly lit tanks are spread all over the reef and all sorts of depths (for example, Pseudanthias squamipinnis or Lyretail anthias, is found anywhere from 6.5 ft. down to 130 ft.) Same with cardinalfish. Same with basslets. Same with gobies and dartfish and chromis and damsels...and the list could go on. MANY corals (especially softies) are found at deeper depths: colts, nepthea, bubbles, M. capricornis etc.
So, you can actually pull of a deeper section of the reef slope while not breaking the bank (or even worrying about dropping temperatures--unless you're going for something like 300+ ft. of depth) or trying to get all sorts of crazy fish and corals.
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