Hard to give exact answers to what needs
repair or replacement without an expert
inspection. Not a
Yanmar expert but some heavy duty diesels can run for 10,000 hours with no problem. How well it was maintained, whether it was ever abused (over heated, run low on
oil, that sort of thing) could make a huge difference in the
engine. It could be good for years or could be on it's last legs.
Rigging, yes all the experts say replace it no matter how it looks if it is 8-10-12 years old. Which number you pick depends on which expert and whether the boat was sailed hard, tropics vs northern etc. For a charter boat in the tropics I would lean towards the low end so may be reaching the useful life of the rigging. That being said, there are some that claim you can use your rigging as long as it is carefully inspected. If you are a bit new to sailing and boat
maintenance, err on the side of caution and also making your
insurance company happy.
Electronics. I would use them if they
work. If in good shape and they do what you want why replace them? If you must have all the latest bells and whistles and have plenty of money then ditch them all and get new.
Other stuff depends on your personal preference. Some are happy with no
engine, no
electric and a bucket. Others can't leave home without everything up to a washer/dryer. But don't forget the more fancy stuff you have the more
repairs which is time stuck at a
dock waiting for the electrician and spending more money.
My compromise for comforts: good stove/oven and
refrigeration, small hot
water system, small air conditioner for very occasional use.
As far as the price, best bet there is to look at every similar boat on the
internet and see what they're listed at. If you know an honest
broker ask them for
advice.
With five on board if you are cruising and
anchoring you will need a pretty good
dinghy. Perhaps a 11-12'
RIB with at least 15 HP, I would go 25 HP to move 5 people on plane. New you could spend $6000-$12,000 depending on brand and HP.
6 man
liferaft $2-3000 for a low end coastal, up to double for a high end
offshore.
Beneteau is fine depending on what you plan to do. Standard
Caribbean and tropical cruising certainly.
Anchor I would have 50-60 lb new generation
anchor (Manson, Spade, etc) with 200' of 3/8" chain and a 40 lb
Fortress for backup.
But as mentioned, it's all theoretical until you see the boat and condition. Everything on it could be in great shape and ready to use or could be worn out and ready to trash.