Except for a few PC models, I own examples of every 2nd and 3rd gen 45 made. Given your range only specification and only "standard", regular production models on your list of choices, I would suggest a late model 4506-1.
While the company officially ended 4506-1 production around 1999, they continued to make 4506-1s for almost ten more years to fill LE contracts. Some of those LE Special order 45s were spectacularly accurate with triggers as good.......or better, than some of my Performance Center 45s.
There were also 4516s made up till around 2005 or 2006 to fill LE contracts. I have one and it rivals my Shorty 45 MKII for accuracy. Very close between the two pistols.
These 4506-1s and 4516s made for LE usually have laser etched markings on the slide and frame. That is an easy visual cue. There are roll marked versions as well. The majority have MIM hammers and triggers, another visual "tell". Well worth hunting down one of these for a fun range gun.
The 4516 shoots extremely well, for me. I don't think you would be displeased with either model.
As to parts and mags, I wouldn't worry about it. They just don't break. Mag springs and followers are readily available from several sources should you need to rebuild mags that are worn out. But in over 22 years of shooting these guns, far more often than most, I haven't worn out a single range dedicated mag yet.
The only parts I have broken were a mag catch on a 4516-3, which I replaced with a steel part from a 4566 - a sideplate on a 457 which had 9000 rounds through it - a plastic/vinyl mag catch on the same 457 which was worn from use - and some sights/sight blades which I damaged while carrying the guns. I just don't see a problem with getting spares. They are out there. On the rare occasions they are needed.
Good luck with your decision! Regards 18DAI