Welcome.
IMO the .44 Mag and the .45 Colt are reloaders weapons.
That is to say that the cost of factory ammo makes them much more appealing if you reload.
They are kind of the opposite sides of the same coin. With .44 Mag factory ammo tends to be a bit warm. With .45 Colt factory ammo TENDS to be cowboy action low level .45 ACP levels with a rim on the cartridge.
If you want to shoot light .44 Magnum you have to go with low level .44 Special that's expensive, go with a few specialty loads like one available from Georgia Arms
http://www.georgia-arms.com/ or load your own.
If you want to shoot heavy .45 Colt you have to go with expensive specialty loads like Garrett, Buffalo Bore, Cor-Bon and a few others or load your own.
For me, I chose to go with the .44 Magnum because, 1) ANY firearm designed and labeled for .44 Mag SHOULD safely chamber and fire any factory load assuming it's in decent shape. 2) There's a whole lot of .45 Colt originals and replicas out there that are simply NOT designed for high pressure levels. 3) I reload and can produce .44 Special level loads in .44 Magnum brass that should be safe for anything it might get put in. 4) While I can load warm/hot .45 Colt I prefer not to have ammo lying around that's potentially dangerous if loaded into a firearm marked for the same caliber.
These aren't exactly long range platforms but they hold up pretty well with a little practice from the user.
Check out the pre-purchase guide on the 92 board.
Before you go hawg wild with polishing and files Hose it out with de-chlorinated brake cleaner with the stock removed, lube it and work the action and repeat cleaning and lubing after 500 to 1000 dry cycles. Don't dry fire, simply hold the trigger down and allow the hammer to follow the bolt down easy.
You may be surprised at how little actual metal needs to be actively removed. (I still haven't touched any of mine with a file, stone or emery cloth and I haven't had to shorten any of the springs either.)
The Smith Shop stainless followers are nice and affordable and they're good people.
Good luck.