I would take anything the dealer said needs fixing with a grain of salt. They are notorious for recommending repairs just cause they think you will pay. With that said, the only thing on the list that I know you might need is the timing belt service as well as the power steering pump since they tend to leak and will eventually kill your alternator if not fixed. Now I'm not saying the pump is bad since I don't know. How long have the couple owned the car before selling it to you? At the very least you need to change the TB/WP, etc... for peace of mind but I would find an indie shop and let them look over it before I kick out that kind of dough or better yet give it back to the couple and continue your search.