By all means purchase some type of .22 pistol. They are a great way practice technique as well as not break the bank.
I have a Browning Buckmark Camper in stainless that is excellent. They can be had for about $275 if you look hard enough.
In my nightstand I have a Taurus 1911 .45acp. This is a fantastic 1911 for the price point. I can shoot tighter groups with my Taurus (probably the Hiene sights) than with my fathers Kimber Custom II.
I also have a Springfield XD 9mm which I prefer over the Glocks. The grip angle feels more natural than the Glock in my opinion. It is also extremely reliable. Over 3000 rounds and never a single FTF, FTE, jam, or malfunction. This is with varying types and brands of ammo as well.
One last point. Whatever you settle for, please test the ammo you plan to use for defense. Run several hundred rounds of it through the gun to assure it works. Some of the self defense ammo (JHP, frangible, etc) can be a bit finicky with certain guns. Test it because your life and your families life may depend on it.
2007 Speedmaster w/ SS Long Slash Cuts, K&N, Polaris Bellmouth, and AI Removed
132/42/2.0 Turns Out/No Shims