Check out Gavin's Ultimate Reloader site here for a wide range of informational videos on various setups:
http://ultimatereloader.com/
After watching his videos I graduated from my single-stage (actually a Redding T7 turret) to the Hornady Progressive AP press for pistol cartridges where a powder drop accuracy of +-.1 gr was tolerable. I relegated the turret for rifle cartridges where tighter powder load precision is required and I can still weigh each charge.
Even so, I spot checked 50 Hornady powder drop loads recently (.45 ACP) and found no discernable variance using my digital scale.
Your mileage may vary...