Since the setup is nearing completion, have you decided on how to start up the tank yet ?
Mine is not as large but as it is also a new setup and of significant volume, these are the options I'm considering:
1. Real alive rock and sand (Tampa Bay Saltwater, Gulf-View, etc)... advantage is the biodiversity - although many of the cool sponges and tunicates will ultimately die - and the very accelerated or absent ammonia cycle; disadvantage is cost and the guaranteed undesireable hitchhikers like mantis shrimp and gorilla crabs that might be impossible to get out of a big display tank
2. Dry rock w/o organics (ie BRS Reef Saver) with dry sand, seeded with live rock and live sand - disadvantages are absence of cool stuff on the rock and extended ammonia cycle; advantages are no hitchhikers and time to create a sturdy aquascape outside the tank. [From everything I have read, natural dry rock e.g. Pukani needs an extended curing cycle, potentially for several months, so I'm avoiding it].
3. Cured live rock and live sand from LFS - which sort of has some of the advantages and disadvantage of both. I did this last time around and it worked out okay but seems the rock available now isn't as nice.
Another option is to find an established tank of similar size and move it into the new system. I have a lead on one that is similar size to mine, but not sure it will work out.
I'm going to check out the LFS this weekend and see what's available, but at this point I'm leaning towards BRS dry rock in the display and a small TBS 'package' for the refugium. My thought is some of the desireable hitchhikers will seed the display while the undesireable animals will be locked out. And as cool as the fresh live rock looks, ultimately I want to decorate the display with corals of my choice and not even see the rock underneath!