I suggest the 22/45 over the .22 because of a few reasons. First, the grip angle is like the 1911's. So if you get one [1911] later on, you will be use to the shooting position of it. Second, the controls are in the familiar place. The slide lockback is where it's suppose to be, and more importantly, the magazine release is where you'd expect it to be, on the side by the trigger housing.
It's a tack driver, pure and simple...
Also, it digests anything and everything, all day long. $10 brick from Kmart, you are good to go for an entire day.
Albert