I prefer the .357sig for carry or defense. It's fast, powerful & feeds great.
If you want a new .45acp, check out the new model Glock 30S. It's a 30 type frame with a sub-compact 36 slide. It's slim & compact but still offers the highly rated .45acp load.
or a Glock dealer for available pistols. They may be rare for the first 6-8mo due to the huge push in gun sales.
The ParaUSA LDA .45acp & the S-A compact .45acp brands are decent too.