@sacguy71, thanks for your ideas, I'll put VPME Euclidean back in the "maybe" list : )
@GarfieldModular, thanks for the ideas above. BTW I already have Vector + Expander... yes it is a beast. Lately I've been considering "what else might I add and why?" This thread plus some additional web viewing have convinced me multiple sequencers are in fact a great idea. Of course Vector has so many lanes you could already consider that multiple sequencers, and do some interesting things like combining or switching lanes with downstream units.
@greenfly, thanks for your response. I'm curious, how are you using those various units you mentioned? What are a couple normal use cases / patches you'd run on that rig? That's a pretty significant set of sequencing / clocking power!