I too favor single stack 9mm 1911s. My favorite pistol out of the 50+ I've owned in the last 15 yeas is my Nighthawk 1911 in 9mm. I had a Para ord polymer frame 18 rnd 9mm 1911 as well. Something great about the 9mm round in that 1911 frame that I really like.
Still, a single action pistol isn't optimal for some folks due to legalities, regulations, and such, and a striker fired polymer single stack has been long awaited from Glock.
As others have said, the Sig225 and in my country (Canada), the Sig220 in 9mm with the standard side magazine release (many are the old heel release, blah), are two I'll never sell, and I have 3 Sig 220 9mm, as they are rare, and one is staying NIB. Single stack 9mm pistols are great IMO. The grip angle of the 220 9mm is far superior to the P226 IMO, it points far more like a 1911, and less like the loaf of bread with a broom handle shoved in it like the 226 does for me.
We won't get the Glock single stack 9 or the 380 here in Canada for a while, somebody needs to make an extended barrel for them to get around our dumb 106mm barrel laws first. I won't lose much sleep over that, but I'd still be interested to see them and see how they shoot.