I would say option 3.
My experience with this is my husband bought a house while we were still dating and kept asking me to move in. Well...I told him that I would not move in with a man unless I was married. Less than a year later, we married and I moved in. But, even though I had my own apartment, I spent a lot of time at the house and I helped picked out the paint for the walls, furniture, etc. So, I think if you are able to purchase a house before the wedding, definitely do it, just keep the one not living in the house involved in all the decisions, decorating, etc. and build a life together without actually living together until after the wedding. Just my 2 cents.