Here is a link to a true comparison and evaluation of Dillon, Hornady and Lee progressive presses:
http://www.comrace.ca/cmfiles/dillonLeeHornadyComparison.pdf
I do not want to hear cheerleading
("XXX is the only choice!!") - I prefer a carefully-considered and well-documented evaluation that will allow me to reach my own conclusions. The evaluation in the ink above is just the type of thing you need to get a good idea of the features of each press covered in the evaluation. You will have to decide which press is a better value and which fills your needs, based on your own requirements.
I ended up choosing the Hornady LNL AP press and have been very happy with it. This press was chosen for two reasons:
1 - A used press (from a friend) became available to me at a very good price, and
2 - The evaluation posted above allowed me to conclude that both the Hornady and Dillon presses were quite capable of filling my needs, and either would have been a good choice.
Since you (the original poster) will load for many different calibers, you should pay particular attention to the time and effort required for specific-caliber setup and for caliber changes. How quickly can you change dies (or tool heads, for the Dillon) and shell plates? How long does it take to adjust the powder measure, and is a micrometer-type adjustment available? What about other adjustments, for example the case-activation part of the powder measure?
Is price important? Check prices for fully-configured systems, including the automatic case feeder. My take was that the Hornady LNL AP system was substantially less than the Dillon 650 system, but check for yourself as prices change. You might be able to find a good deal (like I did) on a used press.
Good luck,
Randy