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G19 but if you can deal with the longer grip length of the 19x/45 and like the balance of those, nothing wrong with the G45/19X either.

Spent a ton of money on a metal grip, dovetail relocation, special holster, magazine mods, etc, etc, etc when I could have just bought or built a P320 variant and gotten most of what I wanted without...

Check Pm.

Does 320 has the option of using kits to change the caliber??

I'm a Glock fan so I'm biased. I looked at sig and chose a 19x for my most recent purchase.

What do you want out of a marial art? In addition to focus and discipline, what else?