1.5x your Gross Vehicle Weight for the proper winch otherwise you could be stuck and the winch will just stall out on you.

If you are going to winch, the synthetic lines are also a good idea since they are alot lighter and safer. They store no energy so if it breaks, it drops. If a steel line snaps, you could have a missle coming at you. Alot of people put a blanket over the line but I've heard mixed things on if that really helps.

You could use straps, chain and Hi-lift to get out too- if there's a tree or something around. Use a blanket or something so you don't tear up the bark.