£2000 is definitely realistic for a private sale. Yep, there's diamonds and dogs in that era and the ratio of dogs to diamonds increases from about '74 onwards.
Make sure you try before you buy.. most 34" basses (not just Fenders) are susceptible to the dead spot, but IME it has to be pretty severe to be noticable whilst gigging or recording.
Don't get too hung up looking for a Sadowsky-like neck pocket - you could be looking for a while. Just make sure it feels stable. Check for fretwear - the frets on bound necks can be replaced, but it's time-consuming and expensive. And, be aware of the weight if it's something that bothers you. Some 70s Jazzes are heavier than a bus.
(Incidentally, as for Fender vs. Boutique, to be blunt.. you won't have much of a problem with resale if you go Fender. If you buy a new boutique bass, make sure you're prepared and able to take a hit when you sell it.)