Blade, do you have floorboards upstairs? If so, before you set up your new tank, it might be a good idea to check they are in good supporting condition before adding that extra weight to them (especially if it's an old house, like mine). Have a check of the joists. I discovered a joist had rotted away in one corner of my living room (when I got a carpenter to check it) - it meant having some work done before I could place anything heavy in that corner. I had some extra supports fitted so that I wouldn't have to worry about the weight of the tanks. I have 6ft in total of tanks in that area now.
Oh yes, and I remember reading somewhere that when moving a tank, take out the fish and most of the water (but keep most of it in clean buckets), leave the gravel etc with some of the water. When pouring the water back into the tank, place a large jar or container in the tank and pour the water into the jar slowly and as it overfills it will gradually fill the tank without upsetting the gravel/plants etc and making too much of a mess. Not tried it myself but I made a mental note to remember this as it sounded like fair advice.
Athena