The thing that concerns me about these 3rd generation (and even earlier generation) metal-framed guns is how long will parts be obtainable? If I remember correctly, S&W isn't maintaining them anymore.
The thing about a 1911, especially a good one, is that they are a dream to shoot...and you can get a wide, wide variety of aftermarket parts for them. Any gunsmith should be able to work on them, if you buy one without a lifetime warranty.
SIG P220s are a great choice. H&K makes very good pistols too.
Other alternatives are the polymer frame models on the market today...like M&Ps, from full size down to the Shield. Ruger has a new polymer .45, the American. They also make another polymer pistol, the SR45.