Surprisingly, no one has mentioned the Ruger SR9.
While it's not a single stack, it's not very wide, about the same as a 1911.
It has the safety in the same place and the same grip angle as a 1911, too.
And it sells for around $400.
Walt Kelly, alias Pogo, sez:
“Don't take life so serious, son, it ain't nohow permanent.”