After thinking about it some more, I think I am headed towards the 650 upgrade. I would like to have the case activated powder drop, which I obviously don't get on the BL550 and a priming system is a plus. The RL550 is way over my budget anyway. That being said, I would probably want a strong mount and a roller handle, which is another $200 and change. That would put the basic BL550 several hundred more than a 650 upgrade with case feed plate, powder measure, and a priming system set up for large primers. I'm not shooting benchrest, so I think I'll go this route.
For the few rounds that I do want to trickle powder for, I can do that on the single stage.
Thanks for the input.