The SIG was the best feeling double stack sidearms I ever handled, and I have handled just about everything over the years. The grip was just rounded perfectly and fit my hand like it was made for me. I loved it and carried it for about four years.
Then, I got my hands on a 1911. There was a world of difference. The single stack, slim grip was absolutely perfect. I have medium sized hands with long fingers and the 1911 fits like a glove. After handling the 1911, the SIG just felt fat in my hands. I don't even want to think about how my friend's USP's felt (both the full size and compact felt awful).
I also prefer the single action. The single action on the SIG was similar and very nice, just a tad heavier. However, that first double action pull was a beast! I prefer clicking off the safety and having a consistent trigger pull from first shot to last.
Carrying cocked and locked is no big deal. The safety is pretty hard to deactivate deliberately (not to say it can't happen of course) and combined with a holster that completely covers the trigger area is very safe. It takes a little more practice to get used to a 1911, but I feel it is worth it. Since you wnt a safety on whatever gun you get, this is not a big deal.
For me, clicking off the safety and getting off that first shot is a lot faster than pulling that double action first shot on the SIG. The only way to remedy that would be to send it off dor a trigger job. However, a good trigger job is expensive.
The safety is not a big deal on the SIG simply because that first pull is so heavy.
My father swore by his M9 for years. he loved that gun. He preferred the "wonder nines" over everything else, as he was trained on a Browning Hi-Power. He got the 92 because he couldn't find a Browning at the time and just fell in love with it. It felt alright to me, not as good as the SIG, but the Cougar just felt a bit better balacnced for some reason. However, the Cougar is a beefy gun all around and might not be the best for concealed work. I do, however, reccomend it over the 92, but a lot of people will tell you otherwise. Just my personal taste.
The Cougar is also available in four calibers so if you switch up, say to a .45 from a 9mm or .357 SIG, the controls and ergonomics will be familiar to you. The SIG 226 and 229 are available in three calibers, but their ergonimics are different from their single stack .45 P220 model. You could also buy a 9mm 1911 to start if you are considering a .45 1911 later on.
Just one question for you: why is not having a safety on a double action such a big deal? I always felt the point of a double action is so you don't have to worry about the safety. In fact, I feel a safety plus a double action pull is too hard to work with if you have to use the weapon.
I know you had some apprehension about carrying a 1911 cocked and locked, but a double action is carried the same way, just with a heavier initial trigger pull and without a safety engaged. The double action pull just takes the place of the safety, but it is basically the same thing. The single action/safety combo is a lot faster than the double action and surely a helluva lot fster than a double action combined with a safety.
If you are carrying for self defense, whatever is fastest to get ready is usually the best. there is a stigma to single actionpistols, but that is usually perpetuated by people who don't have much, if any, experience with single action pistols. With practice and common sense, a 1911 is just s safe as any double action pistol available. In fact a weapon is only safe when utilized with practice and common sense. There is no such thing as a tamper free/accident free/child proof weapon unless you apply knowledge, education, and commmon sense.