Mat, a few comments
-- re: PNW, what you said makes a lot of sense.
-- S&P and DUSG, IMO you might find more inspiring current alternatives, esp. if you decide to save some of your "I want Buchla-ish stuff" for when the new Tiptop/Buchla stuff is available. While I already have a LOT of modular stuff, I might grab a fair amount of the Tiptop/Buchla stuff when available... it may be just too tempting to resist, even if strictly speaking, I already have a fair amount of that functionality in my rack
-- last, I have to say, the "I want Buchla-ish stuff" urge could go a few ways. For me, a loose interpretation of "west coast" (vs "east coast synthesis") is accretive (vs subtractive), vactrols & LPGs (vs other standard filters & VCAs), happy accidents (vs played / programmed), and innovative / complex (vs "traditional / simple"). Which is to say, I find myself happy scratching a "west coast itch" with a variety of modules, some old some new some innovative, but which hit somehow the west-coast vibe and mentality. If you wanted to go in that direction also, it provides a lot more alternatives vs. having to hew closely to a few Buchla clones/offspring.
Good luck!