You can use any press as a single stage press if you want. You would just leave off the other dies. I never thought about it but even my 650 would work as a single stage press if I wanted it too. There would just be some extra bulk and parts that move.
Seriously I enjoy doing single stage work on a single stage press though. But then again I have spent way too much money and time setting up my heads for each caliber so that I don't need to do many changes.
You may want to look at the prices for caliber changes for any progressive press you want if you are doing more than a few different cartridges. The extra expense can add up fast. That is one thing you really don't have to worry about with a single stage press, just the dies and a shell holder.