This works for me, except mine's got a stainless slide. You can find one for under $500 if you shop around.
-the grip is thin and textured, so it's easy for people with small hands (the wife) to handle, and easy to keep ahold of.
-It has a recoil-reducing second spring around the guide rod that really makes a difference on follow-up shots.
-It's DA/SA with an 8lb. stacking trigger pull, so the first shot doesn't go off unless you really want it to (not everyone remembers to keep their finger off the trigger under stress). Follow-up shots are much lighter.
-Visible loaded chamber indicator that can be felt in the dark, so you know your weapon is ready.
-The slide is easy to operate (great for women/children).
-The accessory rail allows attachment of a light (much better than trying to carry a flashlight when you need to open a door) or a laser (for family members who aren't necessarily good shots).
-It's thin enough (about 1") to CCW, should you decide later on that that's of interest to you.
Remember: a 9mm or .380 might expand on impact, but a .45 sure as heck ain't gonna get any smaller.
Good luck in choosing the right weapon to protect your family. May you never have to use it.