I did something like this recently - from a 65 gallon to a 220 gallon.
Transferred all the rock and corals with just a swish in the old tankwater. Transferred _some_ of the unwashed sand, scattering it about as a top-coat over mostly new sand, then put the remainder of the sand into 5-gallon buckets (about six-eight inches of sand in each bucket) and took it outside to rinse it with a garden hose. When the water ran pretty clear, I used that to fill in some of the areas in the new tank that were getting blasted by the current.
The big tank is still fairly new, but everything seems to be growing well ... except for M. lordhowensis. The first one I tried disintegrated, the one I have now is ... getting by. Doesn't seem to be doing as well as the birdsnest above it, or the acros above that.
So my answer to your poll would be a qualified "yes" to _all_three_ choices!
~Bruce