It sounds like you want a 650. The optional case feeder is very helpful otherwise your'e always stopping to load the case feeder tube. I've never tried, but I would think measuring every load on a 650 would be doable but a pain in the ass. Given that there are lots of reasons to use a single stage press anyhow (pullet pointing, etc), I would go that route if I were you: 650 + rockchucker (or turret like the 550 basic). It's kind of annoying to have to set up the 650 unless you buy multiples of everything (toolheads, powder measures, etc), so it's nice to have something ready without all the hassle.