Wow wht an upgrade!! I just moved from a 55 to a 75, and I thought that was big
I set up and cycled my 75 ( took about a month) and moved everything over from the 55 to the 75 once the cycle was done. I did however purchase new sand, and some new rock ( dont have to get new rock if you dotn want to, but ditch the sand, except use a handful or two to help cycle the new tank) I did use some old rock as well.
I was in no hurry to move, so I took my time. It depends on what you need to do how quickly.. but I would definatly suggest that method.. nothing died and everything is actually thriving in the new aquarium.