I tried the whole, "Im only going to have one platform of gun"...
It didn't work for me though.
I love my single stack shooters. I also love my double stack shooters as well.
My 9MM shooters will always be Glocks. I do have a single stack 9MM shooter. One I will never sell. H&K P7M8.
I have my Sig P220s that will never get sold either.
My main carry guns are 1911s. They will be the only guns I purchase for carry and shooting from now on. The others will be used whenever they will be needed.