I started out reloading shotgun for my kid when he was shooting skeet. I learned on a MEC9000 progressive, and wouldn't have it any other way. As soon as Uncle Sam sends me tax money, I am springing for either a Dillon 550 or 650, still trying to decide.
I don't see the sense in spending money on a single stage press only to outgrow it in a short period of time.
My $.03 (adjusted for inflation).