I went to look at one just before I bought the Z.
I did the same thing, joined the owners club, spent some time looking at the adverts and general issues.
Spotted a beautiful black one up for sale, spot on compression, not too much BHP but done conservatively so that it wouldn't have continual issues.
Very nice knowledgeable owner, warmed and cooled the car down exactly how it should have been, went like stink and just a true pleasure to be in.
I'll get one at some point, hopefully as sweet as that one but I didn't want another 90's jap interior to live with at the time.
I felt the Z was a bump up, and a little different from what I had before that (mk2 MR2).
Find a good one, and get a good break down cover, just in case