Art, I just passed on buying my wife's boss's Dillon 550. I will likely go with a Lee Loadmaster or maybe even the cheaper Pro 1000 for $159.00 set-up for 9mm. Unlike you, I only intend to reload 9mm in mass quantities. After researching a lot of websites and forums, I am quite confident I can make a Lee Pro 1000 work just as fast as a Dillon 650. While the Leee progressives are not for everyone, I am well aware of the Lee progressive weak points and feel I can easily deal with any problems that arise. My biggest problem with the 550's are that they do not have a case feeder. Yes one can buy one, but that just adds several hundred more to the cost and you end up with a press that still does not auto index.
I have heard of many guys buying seperate Lee Pro 1000's for each caliber they load because at $159 you end up with a dedicated auto indexing case feeding press.
I do not question the fact that Dillon presses are better quality and have awesome customer service, but I am confident "I" can safely make more rounds per hour with a $159 Lee Pro 1000 than I can with a $500 Dillon 550b.
Graf & Sons - LEE PRO 1000 RELOADER 9MM LUGER