Your house and fiancee are more important than a piece of cardboard, even if it doesn't really exist. 
If you don't have the funds then you don't have the funds. That's a lot of money, even in his day and age of 1/1s and Cup/Exquisite cards that could pay for a car.
I've passed on cards many times in the past because of cost. They were all cards I certainly would have loved to have, but I was able to sleep easier once it passed me by than fretting by over the buyer's remorse and kicking myself.
No one is forcing you to buy it, no one will force you to pass on it. Any no one will ridicule you later for letting it go.
