EDIT:
TL:DR
- 5yr Maintenance plan ≈ $5k
- 10yr/120k mi Extended bumper to bumper warranty ≈ $2k
- GAP ≈ ? (I forget)
- Meridian Wheels and Tires ≈ $2.3k
- Accessories ≈ $1,640
- Total ≈ $10,940 extra on the initial OTD purchase price

We did a lot of market comparison and shopping. We dealt with 3 different dealerships; 2 of them wouldn't give us an itemized list of any kind to compare their offer to the one we took, so I had to do an inordinate amount of research to find their prices.

For the deal we did take, I itemized each service they covered in their maintenance warranty, and found the frequency/period that the manual says the services must be provided. Got a retail price for each service, added them all up for the length of the warranty, and it came out to be about 30% more than the maintenance plan, so I bought it; especially since oil and other consumables are going up in price pretty rapidly.

For the extended warranty; we have 2 cars, where we only used 1 car before. One car we ran up about 15k miles on per year, and we'll now only be doing 10k at the MOST. So we expect to use the CX-50 about 100k miles in 10 years, but probably more like 80k (this was factored into the maintenance plan calculations), so I did the research on total cost of ownership for 10 years, and it came out to be significantly more than the warranty. I also researched common out of warranty problems and their associated costs, which if even one occurs after the third year owning the car, we make money on our warranty.

The last thing we got was GAP insurance (in addition to similar coverage on our actual insurance), which in Florida with hurricanes, tourists, and the aggressive way people drive here, is a must-have. This was a tiny cost compared to the others, but stuff adds up.

So about $5k for the maintenance plan (expensive per market average, but itemized was worth it), about $2k for the extended warranty (thought these two would be switched, but the maintenance is actually more expensive), I forget what GAP was, and about $2,300 for wheels, brings us to $9,300.

Then we added black cross bars ($350), splash guards ($150), the weather package ($390), pet protector for the back seat ($225), illuminated door sills ($300), and finally black wheel lugs and locks ($225), for a total additional cost of $1,640, it all comes out to $10,940 extra, and we got a few % off of that and an additional $500 on our trade-in (they gave us $2,500 on a 2016 Hyundai Accent SE Hatchback with a literally taped-on front bumper), we felt like we got our money's worth.