I can't say that there is only one reliable 1911 out there. There are many gunsmiths that make the 1911 very reliable.
I would suggest shopping around for a 1911 made by Les Baer, Ed Brown, Springfield's Custom Shop, Wilson Combat, and there are many others out there.
A couple of forums to get educated about reliable defensive 1911s is
www.pistolsmith.com and
www.1911forum.comOn thing to consider about 1911s is that many of your hardcore 1911 guys treat the 1911 and the pistolsmiths that build them much like a religion. You will hear a lot of bickering back and forth of which is better and why. There is a lot of information to sift through, but hang in there and you'll find something that suits your needs.
I have a Les Baer Thunder Ranch Special, one of the reasons that I chose this pistol is because I wanted a no nonsence defensive 1911. On man that knows 1911s is Thunder Ranch's Clint Smith. Les Baer made the Thunder Ranch Specail to Clint's specifications. If you know much about Clint, he rarely endorses anything, and only contracted one other person (Bill Wilson of Wilson Combat) to make a pistol for Clint's students. Wilson Combat made a limited number of Thunder Ranch 1911 pistol, then Clint went to Les Baer to and asked him to start making his Thunder Ranch Special. Clint stated that he had seen a number of Les Baer's pistol come through Thunder Ranch and he was impressed by the work done by Les. Everyone that I've talked to that owns a TRS is very please with the pistol. I would compare the reliability of my TRS to my Glocks. Here's a pic:
I also have a Springfield Tactical Response Pistol, which comes from the factory tuned at the custom shop. This pistol has been 100% reliable. I purchased this one in early 1999 when they first came out and paid $800 for it. A good deal considering that it's been tuned by the Springfield Custom Shop. Springfield has since updated this pistol and added a few things to it, and it now goes for $1100 - $1200, but is still a good value for the $$$. A friend that I work with has the new updated TRP and it's been 100% reliable. The only thing that I didn't care for is the 20 lines per inch checkering on the front strap, it's a little sharp. I ended up sending it back to the factory to have the checkering "defanged" and I also had them remove some material where the trigger guard meets the frame, I like to have the trigger guard go straight back and then the front strap to go straight down (instead of being rounded in this area)
Good Luck