Most of us with older Jeanneau's, feel they are better built etc than the newest XXi series boats, more actual wood, less plastizised wood etc.
I have a mid 80', I believe the mid 90's versions are on par, then around 02 a few changes/redesigns occured until 07-08 when the i series came out. Any rig up to that point should be reasonably built.
Another forum/site you can check, is
Forum - jeanneau owners network - Home
General site/info - http://jeanneau.tripod.com/