The Springfield stainless GI model looks perfect but is made in Brazil.
Well that was the one I was going to say you should get. Before I even read all the way though your post.
First off I thought they were made in Geneseo, IL.
Second I do not like the sights on the GI and the money it would take to get a part of Iron sights tailed in would not be worth it on a 500 dollar budget. I also do not like the fact that there is no beaver tailed palm grip style safety and I dont like the non ajust. trigger. But, you will not be using your Springfield for a target or TAC. gun. So I do not think it would matter.
I am a avid Springfield Armory shooter. I do not own the GI, but I do own about 6 Springfields. And in MHO you will be hard pressed to find a better gun then the GI 1911 Springfield style 1911s for 500 dollars.
I know you said SS and metal frame but, 500-550 dollars will get you any Glock out there. You could go .45 ACP/GAP or 10MM or .357 SIG for about $550.00. I also know you said no .357, I take it you meant357MAG. IMHO the .357sig is a hole new beast also IMHO I think I might like it more for a carry gun then the .357MAG.
As far as AMMO. I do not know if you "role your own". But if not there is not many cheep rounds out there in the CAL. we are talking. I do not know what you mean cheep. Cheep to me is .44mag. out of the box rounds. Cheep to some people is 9MM out of the box rounds or even .22LR. But I would say on AVG. with the rounds we are talking about you are looking at no less then 10.00 a box. That to me is dirt cheep and would not care about that.
As far as 6 shooters go. You have limited your self IMHO to about a Taurus. :? I do own a Taurus but it is a Raging Bull. It is every thing you noted but about $600.00 by the time your out the door.
I think You best bet might be look around for a nice used deal out there. You can find great guns like new even sometimes only a few 100 rounds though them at great used prices. Unless you can swing a few hundred more buck. That would open many more doors for gun options.
Just MHOs.
Dave.