I know what you mean with the owners thing. When i bought my Nissan 200 5 years ago the HPC said 6 owners, but the log book when it came thru had 9 owners on a car that was 8 years old. I thought I had bought a lemon - I've now owned it 5 years with no probs.
I think the car changed hands several times in short succession, the guy I bought it off had swapped his S13 for my S14 cos the previous owner wanted an S13, he then decided he didn't like it and decided to go back to an S13 himself, so I boyught the S14 off him. Hence 3 owners in a 2 months