I own a 550 & 650, I love the Blue, but would never buy a SDB. I know you say now you only want to load handgun, but why limit yourself? A 550 will do anything 90% of reloaders need done @ 400rs/hr easily. I could do 200rds/hr with just one arm. If you must have a case feeder, then a 650 is the way to go. The 650 is waaaaay more press than the vast majority need, but need & want have little to do with each other. For multiple calibers, loading small amounts, the 550 is hard to beat. I currently load 23-24 diff calibers, most on the 550, some on the 650, some on my ss.