Hmm..the Glock Kaboom! FAQ. Wow.
With the octagonal rifled barrel (on at least the .45's), along with the feed ramp setups on a stock Glock barrel, you should always use SAAMI spec factory ammo with new brass.
With that being said, my Glock 30, my Glock 21, and my wife's Glock 23 all have had many rounds of ammo through it (my 21's had nearly 10k rounds, my 30 about 3000, and my wife's 23 about 2500), with zero issues.
From a liability issue, my recommendation is to always keep ammo in it that a local law enforcement agency uses. All of my .45's use 185gr +P Winchester (which is what the County and State uses in their .45's), and the wife's uses the same Speer Gold Dot that the local police department uses in their Glock 22's and 23's.
As for more ammo the better - there is a reason why Massad Ayoob loves the Beretta 92F with the 20 round extended magazine filled with 115gr +P+....you never know when you need that many rounds, and in an extensive firefight, reloading may not be an option. That's why my wife's Glock 23 (when it's in her side of the nightstand safe) has the Glock 22 magazine in it.
Back to the question at hand, which is M1911 related - Once you pick a pistol, shoot with it over and over and over again. Get snap caps and practice holster draws, trigger pulls, sighting, hand placements. Do clearance drills over, and over and over again. Get it to where it's going to fit in your hand the same way every time, all the time.
I will say one thing. I've carried an M1911 for years. Trained with it, taught others how to use it, and it's unique compared to other pistols. You must be willing to carry in Condition 1 at all times.
Also be aware that there is some minor additional training and mind sets needed to carry in Condtion 1.
A great case in point is Low Ready/High Ready drills (and I'm talking competition shooting, not self defense). Low Ready, thumb safety on, high ready, thumb safety off. Drill that into your head over, and over, and over, combine that with practice draws, over, and over, and over.....
You don't have to worry about that with a Glock....your trigger finger along the frame is your safety mechanism.
The other thing would be this....and it's about personal preferences. You might not like the Wilson CQB (although I can't see why not) or any of the other ones. Despite the fact that I love my Wilson, I end up carrying my Gunsite modded stainless Combat Commander much more often (and shoot with it more as well) than I do the Wilson. Why? I can't say. I just do.
And I paid (with mods) far less for the Combat Commander than I did the Wilson, even though both have similar mods and tweaks...some by me, some by professional gunsmiths.
So, be careful about spending a ton on a pistol that you actually might not like.