IMHO, at least half the stuff on that list is worthless. Lasers, Front Serrations, match barrels, Adjustable sights are nice, but not needed. You get my drift, I'm sure.
Take the basic pistol from a reputable manufacturer and the basic weapon will be sound. Build on that. Make sure it functions 100%. Than look at optimizing it for you. Forget what is trendy, flashy, or changes the handling characteristics of the weapon(lights and lasers). Consider this your reliability "package".
If you want better sights add them, different style safety, go ahead. Sometimes it is nice to put custom touches on the gun, but make sure they are NOT detrimental to it's use(ie., razor sharp checkering).
Take your weapon and shoot it before modifications. Get to know it, and then make your needed changes. You'll be better off, have more money to spend on accessories, and wind up with a weapon you have absolute confidence in.
Lot's of personal choices here. Take some classes, pistol, rifle, shotgun, etc. Look at the weapons on day 1 and see how they are tricked out. On day 2 and 3 you'll note most of the "cool" stuff is missing. For a very good reason. It's heavy and slows you down.
Case in point. M-16/AR-15 platforms that have dual lights, a laser, bayonet lugs, bi-pods, attached optical sights with pop up sights in case you unit fails. Again, you get the picture.
For extended ops the KISS principle should be in effect.
My favorite AR/M-16? Colt's Light Weight Government Model. Period.
Leave mods off and carry more ammo. It'll be a lot more useful than the items that fatigue you and slow you down when you need speed.
One of the deadliest men I've ever worked with used a box stock Series 70 Colt Government. If he didn't need all the extra's, do I?
TRAIN, TRAIN, TRAIN, and train some more...
Oh, my. Guess I climbed on my soap box on that one. Hit a sore spot....
Your choices, but make an informed choice.