Zeeshan,
I haven't personally shot a Para LDA pistol, but I understand that the trigger mechanism is very similar to the HK LEM trigger in that it is a true double-action trigger with the mainspring pre-tensioned by the action of the slide, which makes the actual trigger pull itself much lighter than a traditional DAO trigger pull. As I mentioned earlier, my first handgun, the HK P2000, does have the LEM trigger, and based on my experiences with it, I don't think I'd recommend it to someone who wants to be a very serious shooter.
The reason is that, although it's one of the best DAO triggers out there, the world's very best DAO triggers will never stack up against even a marginal single action trigger. I know the difference between 4 lbs and 7.5 lbs may not sound like much, but believe me - it makes a difference, especially considering how short a 1911's trigger travel is compared to a DAO trigger.
Now the LEM / LDA trigger does have some advantages in that it allows you to carry a hammer-down, immediately accessible (i.e. no manual safety to disengage) handgun, which may make many feel more comfortable carrying it. That is the exact reason I chose the HK P2000 in LEM - I wanted to be able to draw the gun and press the trigger and not have to do anything else for the gun to discharge, but still have a safe gun while in the holster. The LEM / LDA trigger excels at that, but unfortunately, that is where the excellence ends.
Once you start shooting that gun consistently, if you are like me, you will see that your shooting ability is limited by the rather heavy and VERY long trigger. That's why I have come to the 1911 as the best handgun - probably more than anything else, for the trigger, as it's trigger is unmatched in other combat handgun designs.
Now one concern with the SA 1911 is that there is a manual safety that has to be flipped off, which you might be afraid of forgetting to flip off (I know I was!). The truth is, however, that adapting to that safety is just a matter of training, and it can be adapted to very quickly - suprisingly quickly. If you are using the "IDPA grip" which is an Isosceles stance with a very high grip on the gun, both thumbs pointing at the target, then, on a 1911, your strong thumb NATURALLY falls on top of that safety and in fact rides it the whole time you're shooting, which helps keep it down and from accidentally engaging during shooting. That means that all you have to do to adapt to the safety is get in the habit of, when you draw your weapon and establish your grip, put your thumb up where it goes anyway and press down, and as you draw that weapon and push it out in front of you, the safety goes off automatically. At that point, you have a gun that is MUCH more SHOOTABLE than anyhting with any DAO trigger, even an LEM / LDA trigger. That's why I advocate the traditional, single action 1911.
As far as manufacture goes, Para has a good reputation, though I would stay away from the high-cap mags. I think that the slim profile of a single-stack 1911 aids greatly in controlling the weapon, as it fits more naturally in your hands (for me at least, I don't have huge hands) and conceals much more easily. I think a double-stack 1911 is a bit much. Also, as far as magazine capacity, I think you will find, as I have, that the increase in controllability, speed, confidence and accuracy you will get from switching to the 1911 platform will make you very comfortable with 7 or 8 rounds of 45ACP. If I couldn't shoot it as well, I might like more rounds... but that gun just feels so good to shoot, I really do believe that 8 rounds is enough per mag.
Finally, regarding the best manufacture, again Para has a very good reputation, but for ULTIMATE I would look at Wilson Combat, Ed Brown, Nighthawk Custom, or Les Baer if you've got the $1500-$3500 their guns cost. Springfield has a good reputation, though I would stay away from Taurus - I bought into the Taurus marketing and deeply regret it. I've spent enough on replacement parts and gunsmithing to turn it into a REALLY good gun that I could have just gone with a Springfield Loaded to begin with, though I didn't know that at the time I bought it.
Anyway, this is just my opinion, but I hope you find it helpful.
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