NSG,
I used a Colt trigger because I had one in my "take off" box, and I like a long trigger. Nothing really special about it, except fellows ask where I got a Mil-Spec with a long trigger. I just mention it to keep others from asking the question.
My sights are the regular three dot sights that come on the Regular Mil-Spec. They work, and I saw no reason to change them. The WWII Mil-Spec has the shorter military style sights. That may be what you are looking at.
By trigger safety, I assume you mean thumb safety. I like the extended but thin Ed Brown ambi safety. That is what this one is. Many extended thumb safeties are a bit wide for my taste. The Ed Brown is not. The ambi safety, of course allows the safety to be worked while shooting left handed. With a thumb safety, it really depends on what you like. Some fellows only use a single sided thumb safety (my CCW 1911 is set up that way). Others like the ambi. If I'm going to be carrying the pistol in a IWB holster, where the thumb safety is exposed, I want a single sided safety. Less chance of it getting snicked off on a door frame or seatbelt while in the holster (and nothing is scarier than realizing you have been carrying cocked & unlocked all day). My Mil-Spec is a range gun, not a carry gun, so I put an ambi on it.
Before you buy the Mil-Spec NSG, be sure you understand the differences between the Regular and the WWII Mil-Spec. There are quite a few threads here about the differences.
Here's a link to a good one. Get the one that is best suited for what you want. Then shoot the snot out of it!