What is the best way to change tanks?

[Borderjumper]

We have a 33 gallon reef tank. Its stocked with quite a few corals and some firefish. We are thinking about switching everything over to a 50 gallon tank. Not really to go bigger, just a better made tank. Whats the best way to do this, that will be easier on the livestock?

I have never done this before, but what I was thinking of doing is

1. place the new tank, then add new sand( I think I read somewhere that using the old sand will cause alot of death in the live stuff in the sand, and shouldnt be done?).
2. Put all the corals in a holding tank.
3. move live rock from old tank to new tank
4.syphen existing water from the old tank into the new tank
5.top off new tank with "new" seasoned saltwater
6.put in existing powerheads, heater, and skimmer from old tank
7.add corals and fish

The thing about not using the old sand cause it will stir up too much and bury alot of "good live stuff" doesnt much make sense to me... when you start a new tank with the store bought bags of "live" sand.. doesnt some get buried too? The existing tank is only 4-5 months old.. so the sand is not like really grungy. I know it will take some hours to settle after switching tanks.

Any ideas? Thanks in advance, Shelley