If you feel taking a life is something you do not wish to do, that is fine as long as that is your decision. Someone breaking into your home, as has been stated, is threat enough for using deadly force. Seeing as you decided against deadly force for a reason, I would suggest using a method you feel comfortable with that has the best chances of incapacitation (just remember all these weapons are less lethal, not non lethal).
Talk with a self defense attorney, instructors, and other like minded individuals, and YOU decide what will work best for you, and what your defense will be like if you have to go to court over your actions.
If you have no problem going lethal, I would suggest going lethal immediately.
Less lethal: tazer, baton, bean bags, large flashlight...you pick.
Lethal: 00 buck if you aren't worried about negligent misses. 04 buck if you don't want to completely penetrate walls (apartment or kids in other rooms). Slugs for anything over 30 yards away (subject to change depending on equipment, doubtful that civilians will be making that shot, but not out of the realm of possibilities)