Do not move your junk to the new house. Before you move, purge, purge, purge. Be relenteless. I wish I had done this before we left our big house in Texas, because now we have moved boxes of junk we don't need 3 times, and our 3rd "bedroom" is uninhabitable.
Storage is not the answer. Getting rid of stuff is. What stuff you do keep, make sure it's in small containers/bins so you can store it in closets, under beds, etc.