The problem with the OP's question is that there are so many good 1911 makes out there and probably no one is familiar with all of them. So people tend to advocate what they already have. Most of our opinions are not based upon a true hands-on evaluation as between the various makes and models.
Here in California my choices are more restricted than most other states. After making my own evaluations of 1911s, I went with the Dan Wesson PM7 1911. This is basically a stainless steel Series 70 platform 1911 with very nice components. In several thousand rounds not a single FTE or FTF. They retail for around $1500 and include a match barrel which imparts very good accuracy. The only modification I made to the gun was a tritium dot front sight, available from Dan Wesson for about $45. For the money this excellent pistol is a very good value. I am familiar with the Colt Government model and also own the Colt Series 70 Gold Cup. I actually prefer the Dan Wesson. Not sure if the OP wants to spend $1500 for a duty weapon.
My local gunsmith speaks well of the Smith & Wesson 1911s. Kimbers are good, lots of other makes are good. For a duty weapon one wonders if the non-1911 Smith & Wesson M&P45 might not be a good choice.