I'd offer that properly transitioning from cocked & locked SA pistols to Traditional Double Action (DA/SA, if you prefer) requires more than a little training, familiarization and practice on the part of the owner/user ...
It would probably be of value to have acquired DA revolver skills and experience at some point in your background, since that might be of help in learning to deal with the initial DA trigger stroke of a TDA pistol.
I was primarily a Colt 1911 and SA revolver owner/user by preference before I entered L/E work. I owned and used some DA revolvers, but my main preference was SA pistols & revolvers. L/E work naturally required that I change my focus a bit. I still carried a Combat Commander off-duty, and sometimes a 4 5/8" Ruger Blackhawk, but I was wearing a M66, and later a M686, at work.
I spent a lot of range time improving my DA revolver skills to where I was as satisfied with DA trigger strokes as I was with SA pistol & revolver trigger strokes.
Now, don't mistake my comments to mean that using a SA 1911-type pistol is 'easier', either. A cocked & UNlocked SA pistol with a light & short trigger stroke is just that ... a cocked pistol with a light & short trigger stroke.
When I was involved in helping set up some training for a small L/E enforcement unit to transition away from TDA pistols to SA 1911 pistols, the training incorporated a classroom portion and a range portion, and the new users had to demonstrate safe & knowledgeable handling and manipulation, as well as competent and accurate usage, over the course of some extended range use, both during the class and afterward, before they were authorized to start carrying the pistols.
Both designs have their requirements when it comes to the safe manipulation, handling, carrying and using of them.
Now, if you're bound and determined to acquire the necessary knowledge and skills to carry a TDA pistol for lawful defensive purpose, then there are some quality pistols available.
Personally, I prefer the lightweight aluminum frames for carrying 8-18 hours a day.
Aside from the already mentioned SIGARMS P-245, I'd suggest you try an example of the excellent S&W M457S (Value Line) or the more costly M4513TSW. If you really prefer the additional weight of an all-steel pistol, then the 4.25" 4566TSW is a great pistol.
Now, S&W has recently discontinued (at least temporarily) the public catalog offering of all of the TSW pistols except for the 3913TSW & 4013TSW, so the .45 ACP TSW models might become a bit more difficult to find. They're presently selling them to L/E agencies, although I was told that they'd make production runs for any distributors that cared to place large enough orders for them. Otherwise, they're only listed in the L/E pistol section of the redesigned S&W website.
The owner/user preference regarding the differences between the P-245 & the M457S/4513TSW models are pretty much up to the opinions of the potential users, as both manufacturer's designs offer a good value for the money. Personally, I prefer the DA & SA triggers of the S&W models, and the slimmer grip profile of the S&W's ... but this is a subjective issue, and everyone has their own preferences.
You ought to put in some range time with any and all of the TDA pistols you're considering, of course, before you make a decision.
Best of luck.
