i recently moved house, this was my experiance as it goes.
firstly i got some large poly bags from a lfs, pets at home gave my about 75 large bags and some baskets in which they get their fish delivered in.
on the day of the move i bagged nearly all the water from each tank and labelled it accordingly. (this ensured that the different fish went back into the same water conditions). i left approx 1/3 water in the tank for the fish. i then bagged up all the plants, rocks & decor. lastly the fish were caught and bagged too. the rest of the water was then drained and bagged. the gravel was left in the tank for transportation. i personally took the tanks, fish, water in my own car to the new house.
this is where i done things slightly different. i reset my tanks up in the garage as i had a new tank to set up which was in storage at my mothers.
the tanks were placed where they were going, water that was bagged was then put into the correct tank in which it came from. the heaters were switched on and the tanks left for about 1/2 hour. the fish were then floated in the bags in the tank as per normal.
this method seemed to work fine for me. the only fish i lost initally were 2 neons (this was because i put my large angels in the tank first before the neons and they became dinner for the angles) :=)
since the move 3 weeks ago i have lost more fish which were 1 otto, 2 platy's. but amazinly i have magaged to keep my clows alive and kicking.
i hope this helps you