Suggested Maintenance Budget for Purchase

If your boat hasn't done much in the last couple of years run it uo and down te Juan de Fuca a few times with the load it has and if it still functions re fuel it and go for it.

Having come that way North to South I can endorse the non availability of refuge of a big part of it.

This said,
Make sure the boats is up to the challenge and go for it , there are flat calm periods even in the depths of winter when your old DD's will run like gems at WOT if they can breathe properly.

That's such a conservative approach I would not really bother with it if I was the OP. It's 70 feet of boat, for goodness sake, to much of a doom and gloom approach......

I crewed on a 54' Bertram delivery from NB to Seattle that ran into some nasty stuff off of Crescent City with the added joy of plugging fuel filters, but chalk that up to just another boating experience. This particular boat was not well cared for, but we did have plenty of filters as well as 5 gallon jugs of clean diesel onboard.

I've felt much more comfortable in bigger seas (18'+) on the West and PNW coasts, due to the longer wave period than I have on 15'+ seas in Florida. There are plenty of delivery captains that have done the trip many times, contact one of the bigger NW Yacht brokers for a reference list of qualified captains.

Polishing the fuel ahead of time would be a big plus on the purchase of any used powerboat. You will certainly find a wide approach towards fuel tank baffles and access ports though

The only part I see of NyCap that's really conservative is the wait until Spring part. If one is buying a boat, I would assume they're getting a survey done. As to the spare parts mentioned earlier, are these parts one would ultimately want to have? If so, why not get them up front? As to whether to do any repairs and wait until Spring, how does one decide prior to the survey and prior to any sea trial? I definitely agree with a captain familiar with the area as I don't think a new owner jumping up in size should undertake this by themselves. I would polish the fuel but then after a survey and sea trial that decision might be easier to make either way. I just lean toward fuel polishing because of the idea of starting at least on good footing. Seems of all my reading and all I've talked to, more problems have come from fuel issues than all others combined.

Just seems to me first steps first and step one is survey and sea trial.

That is exactly my point PacBlue. This is not delivery captain. This is a guy doubling the size and quadroupling the complexity of his boat; a person who cruises for pleasure. The odds are against this being any type of pleasure cruising.
If he wants the boat in SF now, he should hire a professional to bring it down, and then he can get about enjoying it in about a week in SF. Few delivery captains I know want an owner on board for a delivery, because they plan to run long and hard and will travel through weather that could take the pleasure out of it for an owner.

If the survey says she's fit to cruise, put on board a tool kit, oil, spare fliters and call a captain. He'll tell you if he needs anything else.