Over the last few months, I have just been through all the research and decision making that OP is going through now.

For pure reliability, productivity, minimal down time, and simple caliber change, Dillon 650XL has it all hands down.

Initial tool head set-up took me about 20 minutes. If not changing primer size, caliber change takes about two minutes. If you are changing primer size, takes about five minutes.

My vote: Dillon 650XL. Tried and true, excellent customer service, and great parts availability.