f you are looking for a .45 ACP, never get something except a M1911A1 first.
Do you mean an authentic M1911A1, with tiny sights, rough trigger, lousy magazines, and loose slide and barrel fit? Or do you mean one of the modern M1911A1 variants, that have been dramatially improved through the use of modern materials, better manufacturing tolerances, better sights, polished feed ramps, no lanyard loop, extended grip safeties, better barrel bushings, ambidextrous safeties, and even (gasp) double action triggers and double-stack magazines?
As long as you don't have to carry it or hit anything, they're pretty good, though expensive.
But you may be right - in my case, owning M1911A1's and some modern variants made me appreciate my SIG P220 just that much more.
John Browning's masterpiece was the M2 .50 cal machine gun, that saw action in every one of America's conflicts in the 20th century, and is still in use by all services today. The M1911A1 is fun, interesting, and common - but not perfect.