A 4 & 5/8ths" .45 Blackhawk, particularly the convertible model, is probably the single most versatile single action I can think of. An amazing and under rated gun.
You can literally hunt everything that walks the earth with that gun, and plink tin cans with it. Elephants to rats. While I love my .44s, I have great respect for a properly throated .45.
A good friend (the gentleman who owns that incredible .38 Special I posted about and am safekeeping until I can rendezvous with him) just recently picked one up that used to reside on a Nevada ranch. It will now reside on his farm and accompany him on his hunts as well. They will take a ton of abuse and just keep going. While not totally indestructible, they are pretty solid guns.
In years past when the topic would come up, my suggestion for a minimalist person who is also an outdoorsman, but not a big time gun nut, would be an RBH .45 Colt/ACP revolver and a Glock 21. Both are simple, have proven to work in extreme conditions, and maintenance is not difficult on either, even in the field.