Actually, one of the main reasons I want a 1911 is so I can get a .22 conversion kit for practice and plinking. I plan to purchase an AR15 for the same reason, actually. I've also found boxes of .45 ammo for $16.50, which is an acceptable price for me.
I just know the 1911 fits me perfectly, which is why the RO is my first choice. I do plan on shooting some other guns first, to make a well educated decision. I'll also look into full sized alternatives if I don't go the 1911 route.
Thanks for the help, I appreciate all the advice!