Are you going to be able to do most of the upgrades, aside from plumbing I guess, before the move? If the fish are going to be out of their "home" for longer then a couple of hours then I would probably tell you to go for the temporary set up. If all you will have to do is plumb everything then I would probably suggest that you just move everything.
Does that make sense?
I usually try to keep as much of my old water as possible, however if its super dirty I will toss it. I wait until the end though to toss the old water, just in case. Also make sure you have new salt water on hand for the move.
As for the sand, there are lots of methods so I don't really want to comment. In the past I have always left some water to cover the sand if I'm just moving the tank. Otherwise I just keep a few cups and start a new sandbed.
Good luck!
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