moving house

Hi
I've already posted this in URAM, so I apologise if you've already seen it.

I am looking for some advice on moving house.
I currently have a 350L tank with an assortment of Discus, Clown Loaches,
Plec, etc.
Whilst I am doing this move I am taking the opportunity to go upto a 640L
aquarium.

It is my intention once we have the keys to the new house, setup the new
640L aquarium, plant it, seed the new filter, let it stabilise for a week
with a few guppies in the tank.
Then move all the fish over, and put all the old filter material into the
new cannister, et voila, new aquarium.

I'm not moving far so the water chemistry isn't different, and the only
thing I need to do is get the CO2 injection on it just before I put the fish
in.

Is this too simple or should I be looking at anything else, advice
appreciated.

Many thanks

Ali