IMHO, when deciding whether to go progressive right off the bat a person needs to understand what they're getting into. Folks also to be honest with themselves about whether they have the technical inclination, the patience, and the attention to detail required for it. And do you shoot enough of a given caliber to justify it? If so it's probably the way to go. It's more complex than single stage but not beyond most people.
The 550 will load a wider range of calibers than any of the other stuff Dillon offers but I think that if everything you might want to load on it is in the 650's range it's a better way to go. As somebody mentioned, the 650 case feeder works for rifle calibers, it auto-indexes, and it can use the powder check. The 650 covers a wider range than the 1050, costs less initially, and is less expensive to set up for other calibers. The 1050 does swage the primer pockets on military cases, if one really needs that, but other than that, I don't see what it does that the 650 can't.
ETA: Some single stage gear is still worthwhile at some point for working up loads or for calibers that are used in small volume. It doesn't have to be expensive stuff, Lee's gear works fine on the cheap.
The 550 will load a wider range of calibers than any of the other stuff Dillon offers but I think that if everything you might want to load on it is in the 650's range it's a better way to go. As somebody mentioned, the 650 case feeder works for rifle calibers, it auto-indexes, and it can use the powder check. The 650 covers a wider range than the 1050, costs less initially, and is less expensive to set up for other calibers. The 1050 does swage the primer pockets on military cases, if one really needs that, but other than that, I don't see what it does that the 650 can't.
ETA: Some single stage gear is still worthwhile at some point for working up loads or for calibers that are used in small volume. It doesn't have to be expensive stuff, Lee's gear works fine on the cheap.