ahhh....a tank move....funnnn.....
I did this with my tank 3 years ago. In my previous house, the tank had a larger pore-size coral sandbed that I had decided I didn't want to move. I wasn't happy with the larger pore size...felt it was just a detritus trap. So, with the move, I dumped the sand. The new set-up was to be bare bottom (which has no changed again to a DSB with sugarfine sand for the newest tank!). At any rate, I was glad to not have to move a sandbed. It sounds like Dana's suggestions are great for doing that.
I transported my fish in old salt buckets, which were a perfect size. Luckily we were moving in June, so it wasn't too cold outside. If you're not planning on getting the fish right away into a tank again, then it might be a bit of a pain to have to heat all those buckets...plus they do need a bit of circulation as well to retain a sufficient oxygen content in the water. I have heard of people buying the cheap kids swimming pools and setting these up as a "go-between" aquarium. They probably have smaller sized ones so that you don't need to make too much saltwater. Maybe this would be an option for you.
If you try to match up the salinity as close as possible, then maybe the drip acclimation will be less stressful for your fish.
Also, I tried to save as much of the tank saltwater as possible. I was able to borrow these huge blue barrels and we filled two of them up. I guess you could use something like a rain barrel. We filled them about halfway full so that 3 people could still carry it together (we have 25 steps up to our house!). I think that starting the new tank with as much of the "old" water as possible is less of a shock to the system and you retain the bulk of your bacteria and other little critters.
In terms of the basement sump...sounds like a great idea. You'll have more room to set up frag tanks and QT as well. Reefcentral has a great calculator that you can use to calculate the headloss on your vertical rise for the pumps. You're going to need a/some heavy duty return pump/s to get the water back up at a decent rate. I forget the specs of your tank, but maybe for this setup, it would be beneficial to have an in-tank closed loop as well so as to avoid a huge loss of flow due to the headloss.
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