Yes, thanks for that recommendation. I did look into that N-50 mixer. $2200 ish new, $400-900 used (depending on condition, age, etc.) But after all the good reviews of the Bosch Universal (Plus), and the cost/frequency of use weighing, I opted to go with a Bosch Universal Plus. Hopefully, I made a good choice.
On the otherhand, I did use the spiral hook with my wife's K5, this weekend for a couple batches of small, single pie doughs (7oz flour). It worked well for that and didn't seem to pound the thrust bearing at all. It did a good job of mixing that quantity, better than the C hook.