Hello, Clarence and all! Richard had it right in my opinion when he said to go for the real Browning as it will hold its value better in the event of resale. I agree. Having said all that, while I have no experience with the FEG clones to speak of, I have found the FM licensed copies to be very good guns albeit with heavier triggers and lesser sights than the current MkIII HPs. The current MkIII is a shooter right out of the box in terms of sights. I had Novaks installed on a couple of my MkIIIs and really wouldn't spend the money again! Nothing against Novaks and they do "look better", but when shooting a Novak-sighted HP against the standard MkIII with factory fixed sights, there was no difference at the target end, at least in my hands. If you get a clone or the FM, you may wind up spending enough to upgrade sights, trigger, thumb safety, etc to have purchased the MkIII.
Clarence, the difference between the plain MkIII and the "standard" IF you are referring to currently manufactured HPs is not much. Both are actually the new MkIII design, but the standard comes with the old style wooden stocks and a bright blue finish while the MkIII comes with the "matte" finish and the nylon stocks. Except for stocks and finish, they are the same gun. IF you are referring to the pre-MkIII standard, it had the old shaped ejection port, small thumb safety, and small fixed sights. It would have been bright blued in most instances and come with the checkered wooden stocks. Depending upon year of manufacture, the muzzle end would have been either flat or had the permanent press-fited bushing that extended beyond the end of the slide about 1/16".
I suspect that the current MkIIIs will outgroup most of the clones, but do not know that to be a fact. I do know that they will group and no longer add match bbls as was the case in the early '70s. They don't need it unless you plan to shoot primarily cast bullets.
The forty will kick more or have more shove. The forty version of the HP will weigh a bit more although I don't remember how much. The slide is a bit wider. The difference is enough that I don't care for the feel, but I'm probably used to 30 years of the 9mm version. Recoil difference is not all that much between forty and +P 9mm, at least I don't notice it. The forty will have more muzzle climb. With selected handloads and factory rounds it likes, the forty will group OK. With the same criteria stated above, the 9mm will group very well and in my experience, better.
I rather like the MkIII out of the box and would search around for one of those as my first choice. If I couldn't get it, I'd try very hard for an FM (Argentine) clone and upgrade sights, etc as I needed or wanted.
Best and good luck.