And no one asking if you have a couple "extra" boxes 
The twyacht Charitable Ammo Donation Drive is alive and well, for those that wish to contribute,.... all calibers welcome..

To the OP, 9mm vs. .40 is an age old debate.,.... Conclusion?
.40 S&W is a great SD round, available in many compact platforms by many manufacturers.
9mm is cheaper ammo, and premium SD rounds are just fine for carry by the same manufacturers.
Either way,
Shot placement is THE deciding factor regardless of caliber.So, huntnelk, welcome to DRTV, consider all the variables that apply to you and what you want out of a small semi-auto, more rounds.? reliability? ease of use? cost? durability? recoil? maintenance?
You are already are a wheelgun fan, and IMHO, a good revolver with good training and practice, is all you need unless you live in a really bad area, even than, they have speedloaders...
So shop around, test drive what you can, read reviews, post specific model, make questions here, (someone will have one, or had one), read the DRTV reviews, PM any of us that might provide specific knowledge of a given pistol.
Check out some online sights like gunsamerica.com gunbroker.com, check some prices to see if your local dealer is on par with pricing.
just my .02 cents....
tw