You can always use a single-stage press, even if you have a progressive press too. Working up a load, pulling bullets and short runs (<100) are best done that way. Still, you should be thinking ahead to a progressive press, especially with .223 and 9 mm, which you will probably shoot a lot. It all boils down to time.

With a single stage press, you are lucky to turn out 100 rounds/hour, and half that is more typical. With a Dillon 550b, you can turn out 300 rounds/hour without breaking a sweat, and 400/hour is not unreasonable. I accumulate 250 or more empty cases and load them up before switching to another caliber. If I get bored at the computer (I work at home), I'll run down to the basement and load up 100 rounds for a change of pace.