I live in BC, and I can't recall what I've paid for just a check up, but that seems high. Although, you don't know what's included so who knows. I'm sure the vet will give him a really good once over. Since you don't know his history, it might not be a bad idea to have some blood work done since you'll be there anyway. He might need to get some teeth yanked if he's been neglected, and it's a good idea to have blood work done before surgery anyway.
If you plan on cutting his nails yourself in the future, just get the vet or vet tech to show you how to properly do it and then you'll be more confident when the time comes. I know a few people who only take their dogs to the vet for nail trimming. It's great to have "positive visits" at the vets anyway, since usually when we take our little buddies there they're going through something painful or stressful. Odie had a really bad experience at the vets once when they had to make her throw up, so I made sure that I took her back often over the next few months just to sniff around and get treats and loving from all the staff. If he doesn't react positively at first, just take him for some visits where he can visit the waiting rooms, maybe go up on the examination table without anything actually being done to him.
The great thing is that if you don't like the vet or feel that they've overcharged you, you can go to a different one next time. Hope everything goes well at the visit!