I have three single stack 9s; a SIG P938, S&W 539, and Husqvarna Lahti.
Only the first is currently in production, and while it's a great pistol, proportional to both its power and capacity levels, it's an awfully small gun to use for anything but concealed carry.
If I were going to go with something larger, for better ergonomics, I'd want more rounds, too.
Though I'm a "1911 guy", I'm no fan of 9mm 1911s.
Definitely fun to shoot, but flunks the size/power/capacity test.
EDIT: I briefly had a Walther CCP, and while I like the feel, and it's reasonable as both a carry and range gun, a lot of problems have been reported with them - I had the mag drop in mid-string - and they have recently been recalled by Walther for some mechanical glitch.