IMHO, start with a single stage. You will always need a single stage on your reloading bench anyway. IMHO - Rock Chucker or Forster CoAx (once you have a CoAx, anything else is inferior).
Dillon - Customer service, IF needed, is none better. They set the pace.....period.
I started with a used 550B 7 years ago. Bought a 450 (father to the 550B - non removeable die plate) for $100 5 years ago (upgraded the auto primer feed and auto powder, but kept the solid head press), and, two weeks ago, bought another 550B.
The 450 only loads 223 AI - that is the rifle round I shoot the most.
One 550 is set up for small primer and the other is set up for large primers.
If you can buy one for cost, don't turn it down, but load a couple thousand rounds on a single stage first....there is a learning curve.
...and...don't forget....learning about reloading is never ending.