Those figures look pretty good for the average guy.
In my world the hangar is cheaper and I've got more tailwheel time than average so my insurance is cheaper than those old quotes.
Maintenance for that is safe most likely with nothing horribly wrong.
Yes, you will have to spend about $35k when the TBO is up. You may find some cheaper overhauls but after you do the accessories and replace the lord mount or two that were bad and overhaul the prop and replace that worn baffling or two and replace a cable or two, it'll be $35 to 40k depending on the shop you go with.
Here are a couple of things to think about for the future of aircraft ownership that are making things a bit more unstable on cost budgeting.
AD's and age.
These things are just getting older and as we go there are more and more AD's coming out that potentially increase the cost of ownership and you should be ready for that. Every time I turn around I've got a letter from Cessna, or the FAA, or Continental. Just two weeks ago something about a backing plate on the magneto's. Last year cylinders, before that seat rails/stops, etc., etc., etc.
The other thing is the pure age of them. When I bought my '73 I only got about six months before I had to replace one fuel bladder. Then another six we replaced a cylinder because it hadn't flown much in the previous ten years.
I fly my 180 an average of 125 hours a year, it looks like this;
Fixed expenses-
Ins. $1,900
Hangar $2,400
Payment $7,200
Total $11,500 = $92.00 an hour for 125 hours per year.
Variable expenses (per hour)
Fuel (now)- $70.00 (14 gal x $5.00)
Airframe-$12.00 ($1,500 / 125 hours)
Engine- $12.00 ($1,500 / 125 hours) hourly for yearly maintenance
Engine - $58.33 ($35,000 / 600 hours) hourly for overhaul cost, I bought mine with 800 hours on it, 1400 TBO, 600 hours to save $35k
General upgrade slush fund - $20.00 ($2,500 per year. This is to pay for future GPS upgrades, skis, float maintenace, radio upgrade, etc.) I also use this for the unexpected AD, etc. A friggin' handheld GPS costs $1,500 and the XM subscription is like $350 per year!!!
Your $92 from above fixed expenses!!
TOTAL PER HOUR FOR 125 HOURS PER YEAR FOR ME!!!! = $264.33 per hour for everything!
That's a grand total of $33,041.25 per year for 125 hours. Of course if I fly a little less my hourly is more but gross is less and if I fly a little more then my hourly is less but my gross is more.
Not many people want to look at the numbers like this because it shows the real cost of ownership while you have a payment and are really putting money away for future work like engines, etc. They are machines and they don't go forever. People who don't do that are the ones you see in Trade A Plane that have the runout engined twin that is being sold for $50,000.
I work airplanes for a living and as such I have to look at the numbers like this to be in business in another ten years.
It's not for no reason that Cessna 180's, 185's, 206's are being chartered for $385 to $450 an hour now.
They are reliable as hell, are fairly simple to operate and maintain BUT they still cost more than you think.
Hope this helps you make the right decision.