Sabreman is a great guy to get information from and has been incredibly helpful as I am in the midst of buying a Sabre 42, survey next Tuesday. He can give you a much better idea of things, but I have pasted a comment he made to one of my threads, hope he doesn't mind. You also may want to PM Alangsys, who is head of the Florida Sabre group and also the broker I've been using, he owns a Sabre and has been very helpful.
1. Chainplates where they enter the boat and attach to the bulkheads. Pay attention to rotted bulkheads where the bolts enter. Pretty common for Sabres to have delam.
2. Mast step. Many Sabres of this vintage have had clogged drains at the base of the mast. The result can be a compromised mast step and delaminated floor.
3. Lifelines. If not replaced by now, they probably should be since Sabre used coated lifelines. Check for rust stains where they enter the swaged fittings. Since the rest of the standing rigging is new, I suspect that teh lifelines are too.
4. Electrical fittings are not necessarily up to modern standards. But the electrics & electronics look very new.
5. Fresh water fixtures and hoses will probably need replacement. The head may need rebuilding. WM sells Wilcox & Crittendon rebuild kits.
The boat I am looking at is Centerboard and I haven't heard any problems in my research, just have it thoroughly inspected. Personally, I much prefer the centerboard option for the type of cruising I want to do. The mechanics I have spoken to have all had nothing but praise for the Westerbeke engine, they have all said it is very solid and dependable. I only noticed one spider crack on the boat, but Alan had more on his. The key is to have the surveyor make sure it is only surface and not structural, all of his were just aesthetic, which you can fix if you want to. As far as rigging, due to the age of the boat, I don't know if anyone can answer a question about the condition of what is on your boat. The one I am looking at was just upgraded to rod rigging, but again, the key is a good surveyor that will go over all of it and report to you any problems.
Best of luck and hope some of my limited knowledge was useful