Get the SDB, you won't be sorry. I have two of them and they are great. I clean the shell plate and lube the rails every 1000 rounds or so. I regrease the handle bushings at around 5000 rounds. The SDB is a great press and a good bargain for the price. You can knock out 750 rounds in three evenings easy and then shoot the rest of the month. That's based on loading a couple hours each day and not hurrying anything. For your expressed needs, the 550 would be over kill. The SDB also comes with dies(which work very well) and you don't have to spend extra money on dies like you would with other models. If you want to load 9mm, just tell who ever you talk to that is what you want and it will come adjusted when you get it. Just set the powder measure and double check the other setting and you are off producing great ammo and saving all that money.