Thanks, all, for your replies.
Having a club member take a look to verify that there aren't huge problems with an aircraft (e.g., extensive corrosion) makes perfect sense. This could narrow down the prospects that I'd be willing to travel a long distance to inspect, as Kevin describes.
I was unaware of aviationdb.com, Kirk; thanks for the suggestion. The site looks like an excellent resource.
And, Hung, I am aware of the FAA Aircraft Registry. I've used it to search for 150Ks, and intend to write letters to the owners I've found (nearest first) inquiring about their planes. Of two relatively nearby 150Ks for which I was able to find the owners' phone numbers, one has a Lycoming 180 hp installed (as well as the consequently necessary auxiliary fuel tank) and the other has been converted to a taildragger (I'm pretty sure I don't want to go there).
I'll try not to be shy about requesting advice on other prospective purchases.
So if any member is familiar with N5985G (blue and white Cessna 150K) based in Watsonville, CA, please give a shout. The pictures on Trade-a-Plane look good and it's just what I'm looking for (except for the dunce cap spinner.) It's such a nice-looking plane that I wouldn't be surprised if it's already been sold after only a few days of being up on the TAP site.
Thanks again!
