If your wife is at all reluctant about firearms this may be a way to ease her into it.
<img src="/forums/images/graemlins/lol.gif" alt="" /> Oh man, good one. No, but seriously, we've been talking about this since before we were married, and just never really got around to it until now.
The other day we went out shooting with a friend of ours (with his MP15), and that sort of served as the spark for finally talking seriously about it.
We would have had his pistol to play with too (Walther P22), but the slide broke in half a few months ago, and the manufacturer is still fixing it.
We're definitely impressed with the ease of shooting of the 22, and with the accuracy that can be achieved. There were things we did and didn't like about the gun though. One big thing for me was the fact that it got dirty enough to not fire within only maybe 150-200 rounds. And he claims it was cleaned before being put away last time. Maybe it's just the novice speaking, but that seems awfully quick for things to gum up.
On the plus side, as people have mentioned, practically NO recoil, and really no need for earplugs either. And accuracy. That was basically my first time shooting for any period of time, and I nailed a spent shotgun shell at 50-60feet.
It seems like it doesn't get much more basic than a .22 Rifle, and that sounds like a good place to start in the rifle category.
Maybe we should just go with a (some?) pistol(s) of the same caliber for practice, and simplicity of only needing one ammo.
As for home defense, I can't honestly ever really see needing to, but I'd rather have it and not need ità