I think the 650 is perfect and is what I have. The 1050 is overkill for most and caliber changes are expensive! The 550 is too much handling. I can load 800 rounds an hour with my 650 and have loaded over 20k rounds in the year and a half that I have had it. Take a trip to The Reloading Zone in wheatridge and talk to Mike. Tell him Chris sent you and you will be able to try a 550, 650 and a Lock n Load. And if you decide you want a 550 or 650 he will have it in stock at the same price as you can buy it online.