RE: Progressive Presses
I have a Dillon 550 and a 650. The 650 w/ the casefeeder is great for loading LOTS of ammo in a short amount of time. If you're planning on loading shorter runs of many different calibers, that's where the 550 shines. A caliber changeover is faster and easier on the 550. I don't do much high volume pistol shooting anymore, so I am thinking of selling my 650 and picking up a second 550.
I will add that Dillon's warantee is second to none. My 550 is over 20 years old, and I am the 3rd owner. They still support the press as if I were Mike Dillon's best friend.