My handgun experience is modest when compared to others on this board, however, I have owned many 1911's, glocks 17,19,21,23,27 and sigs 220,225,226,228 and 230. To me they are all great guns, but their fire control systems are all different enough that to shoot them well I think you will need to practice a lot with just that gun, at least for a while. They are all great guns. In your position I would get the G19 for carry (which you stated was not a concern) and the P228 for a general shooting piece. I would suggest the P225 though, as the single stack mags make for a nicer grip that is more in line with the 9mm caliber. I prefer .45, but if I am going to own a 9mm then I want it to be handy and slim, otherwise I would recommend another .45. Have you considered a hi-power. The skills needed to master that gun should sync up with the skills you need for your 1911 very well. In closing, they are all good guns and I think you would be served well by any of them.
Good shooting. Jake