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I have a 650, but started off with a 550B. The 650 was a significant step forward in cost/benefit and efficiency. I can't comment on the 1050, but personally, I would rather buy another 650 than upgrade.

One thing I would be dogmatic about is GET the powder check die. About half th people I know have had a squib or a double charge. Weigh the cost of the check die to a new gun, new parts/ labor, or the danger to your health if a gun should blow up in your face. I don't rely exculsively on any mechanical device, but along with your close attention, just might save the day should you be distracted while reloading.

There's also those Brain-Farts and Senior Moments too...
-ss