Since I mainly do sports, I'll offer what I do. 1/1000s is NOT the minimum shutter speed for sports, it's more like 1/500. Anyways, for sports I always go to freeze action FIRST, via shutter speed, at slowest 1/500 and any faster I can do, well, even better. I next consider isolating the subject and all of my sports photography is player-centric since that's what I was hired to do; get 8 x 10's of individual players in action. So I then set aperture to as wide as I can within reason, such as not to make the DOF way too thin, but also not too deep. So really, f/2.8 to f/4 is typically pretty good. Last, I ETTR by +2/3 to +1 stop via CWA metering, so ISO is last. Whatever ISO I need to do that at my chosen shutter speed and aperture is what the ISO is. And technology has allowed us to do that. For instance, in toughest shooting conditions, I was 1/500, f/2.2, ISO 5000. In very easy conditions, for outdoor soccer, I could do 1/3200, f/3.2, ISO 400.