GP dentist here...
We do a lot of implants at my office so I will give you my opinion. Everything seems reasonable with the diagnosis and treatment plan. The first thing you need to decide is whether ou want to replace the tooth. If not, there are potential complications but nothing life threatening
Many people are missing teeth and they do just fine but there are potential dental ramifications that you need to be aware of but then it is totally your decision.
That being said, if you want to replace the tooth, an implant is a great option in your case. And if you choose to replace it, I would highly recommend the bone graft.
Now for fees. These differ all over the country and even from one dentist to the next and they could be right next door to one another! And I will say that you do get what you pay for to some extent. I've seen some nightmare cases come into my office and the poor patients trusted their previous dentist because they had initials after their name and maybe lured in by a super low price...so be careful there.
The bone graft fee seems high. Mine is half of that. Might be worth a second opinion there. The extraction and implant prices are normal. I think it should be your choice of the sedation. You don't have to do it. We do a lot of implants without sedation and everyone says that the extraction was the worst part...implant was "easy".
The crown from your dentist will NOT cost $500. It is more likely to cost $1500-2000 with the abutment (connector piece to implant). There is no way around that but it is also done later after the implant heals so it spaces out your expensies and makes it easier to budget.
Lastly, don't delay too much. Dental decay and bone resorption from infection is very similar to rust on a car. Catch it early and it is a predictable restoration...wait and you may find that things become less predictable or cost more money.
Good luck! Oh...and get a CT to evaluate the nerve location and bone quality prior to getting the implant.
Chris