Speaking of older Glocks, I purchased my first one in 1994, a 1st Gen G21. When you loaded more than 7 rounds of .45 into either of the magazines that came with it from the factory, they would barely insert, and certainly wouldn't drop. When loaded with 10 rounds they bulged enough to make inserting them fully impossible. So much for "perfection" was my thought back then, after buying 5 more magazines and having the same result, and having to tediously manually grind down the plastic on the magazine little by little with all 7 to finally get them to function properly. This was early days of the internet, but the newsgroups had others with the same problem, I wouldn't call it common, but it wasn't unheard of either with the Gen 1 .45s. I really liked it after the mag issue was taken care of, superbly reliable, I was primarily a 1911 shooter up until that point, and my first double stack tupperware pistol had probably less than 2 or 3 stoppages that I didn't set up in thousands of rounds.
Speaking of new Glocks, the Gen5 reviews are coming out for the 17 and 19 - looks like they deleted the finger grooves, moved the texturing that is normally on the front of the grip to the sides as well, added an ambi slide release (the left side of the slide release sticks out about 1mm further than the right, making left handed slide release manipulation easier), and changed the rifling in the 9mm G17 to their "target barrel" instead of the previous hexagonal or whatever they called it.
Glad you're getting it all figured out Cav, happy to see you planning for costs beyond just the first handgun too, extra magazines, ammunition, etc, it all adds up fast.
I own a Paraordnance P14 LDA
Para was originally a Canadian company, we wold a lot of their stuff back in the early 2000s when I ran my shop/range up here, and I used a single stack Para 1911 with the LDA trigger in order to use it in IDPA (the LDA trigger didn't qualify as a single action trigger so you could shoot production with it).