I get that you want something that mimics your firearms. Unfortunately, most of the firearm clone air pistols are basically toys. Having said that, I must confess that mine is largely an uninformed opinion since I haven't actually owned, shot or even handled any of the various firearms clone air pistols. I could easily be wrong . . .
I have used a variety of single-shot air pistols -- spring, single-stroke pneumatic and Co2 -- ranging from 1950s-era Crosman bulk-fill Co2 guns all the way to German-made match pistols. Some were quite satisfying, some not so much. The best ones (not necessarily the most expensive ones) really do satisfy your basic purpose of providing useful shooting/marksmanship practice. Even a single-shot pistol will improve your firearms pistol shooting as you work on stance, sight picture, trigger control, follow-through, etc. It doesn't have to look like or operate like a firearm to transfer into better shooting.
I would avoid spring pistols unless they operate recoilless in some way. Single-stroke pneumatics have a much more agreeable firing behavior but the cocking effort is often unpleasant. Co2 is nice but often noisy. Plus there's the hassle and expense of Co2 powerlets. Bulk fill works well though once you're set up for it.
Off the top of my head I'd look at the Beeman/Markman P17 which is a $40 copy of the Beeman P3. Decent trigger and accurate but I don't care for the cocking effort required. The various Crosman Co2 single-shots are good guns. I forget the model numbers (2240 is one, I think) but Crosman has offered a bunch of different pistols that are all descendants of the Model 150 which was introduced in the 1950s or 60s. There are even custom shop versions and there's a whole cottage industry set up to provide aftermarket mods and various improvements. Decent guns that can be made a whole lot better.
Personally, I own a couple of old-school Feinwerkbau match pistols and a few Crosman Co2 pistols. The match guns are the only ones I shoot regularly. One (a Co2 fueled FWB C10) has a dry fire feature that allows you to operate the trigger without expelling any gas or shooting pellets. I've read that master air pistol shooters run about a 100:1 ratio of dry firing to actual shooting. I know I should dry fire more but I rarely do it. I prefer the feedback of seeing where my shots go. But if you're serious about developing your skills, a dry-fire function is pretty important, I'm told.