I own a Springfield 1911 in .38 Super, nickel plated. It's my "El Jeffe" gun. The recoil is mild, and I managed to get around 500 round of ammo with it. I reload, and the cost remains very cheap.
I also own several 1911's in .45 ACP. Ammo is plentiful, but since I reload, the cost is fairly low for shooting, also.
My two Colts are a SS Commander, and a SS Gold Cup.
I would be hard pressed to select between the two, but I would go with the .45ACP if I could only have one 1911. But that .38 Super is sure fun to shoot.