I started with a 550. Ran it for two years and added a case feeder. It was quite fiddly, but eventually worked it out. Got a good deal on a 650; no casefeeder issues at all. It ran very well. Started shooting revolver and needed well seated primers. Had trouble being consistent. I found a 1050 at a really good price (used) and have been more than happy with it. Swaging on the press and adjustable primer seating depth on the down stroke are fabulous. I load 9mm major, 45ACP, and revo on it. I added an MBF for my 9mm. It is a dream! I seriously considered the 650 to start, but was scared of the progressive character of the 650, but really shouldn’t have been so shy. If I had to do it all over again, I would have gone straight to the 1050. YMMV, but that’s just me. You will be pleased with whatever you choose. All of them are fine machines.