I always pipe up when people are talking about the Ruger Mk pistols and suggest the Buck Mark. Barrels are non-serialized and swappable, so you can completely reconfigure the gun without any administrative overhead. Used or new barrels are much cheaper, both as a consequence and facilitator. I find them easy to work on, and like them quite a bit. Deals can usually be found on Gun Broker and around Black Friday. Browning usually offers rebates a couple times a year. I think it's $25 right now. I think I've seen $50, but wouldn't expect that again soon.
Glocks are boring guns, so you have to make the shooting the interesting part. Hard to go wrong with a G34, especially if you're unlikely to be allowed to carry it. Except, and I don't think this has been discussed yet, if you have draconian acquisition restrictions, you may have magazine limits. In which case, Glocks are sub-optimal. The 10-round mags are known for less than perfect reliability.
If I was suddenly dropped into a world, as myself today, in which I had no pistol and acquiring each pistol was a PITA requiring its own permission slip, I would find a Sig P250. The grip module system allows one serialized part to be used as everything from a subcompact to a full-size. Grip modules and magazines are current production and supported by Sig, even though the P250 isn't. Carry gear, if that matters, is well supported. Triggers are sweet. Grip angle is reasonably like a Buck Mark, too. The non-hipster version of this would be a P320, but go find the currently active thread on those to begin learning why not many people around here will recommend one.