Sig P938 HD
I hate aluminum in my guns, so when Sig came out with the HD P238 that was a natural choice for me, and if they came out with a P938 with stainless frame that would also mean I would buy that too.
Not a pistol, but along with many of the comments here, pistol cal carbines to accompany pistols. How has Glock not managed this yet? It is unbelievable they have no offering.