What are the typical facets of ownership costs, for a single engine aircraft?
I've heard it said that the break-even point for owning vs renting is 200 hours/year. I fly a lot less than that, but I don't like sharing my toys, so I own anyway.

I make it a point to not actually count my cost of ownership, because it wouldn't be fun any more, but I'll give you some rough numbers.

I bought a 1962 Mooney for \$30,000. That's about as cheap as it gets, and this was reflected in the condition of the plane and the high-time engine.

In the first year had it, I spent \$18,000 on an engine rebuild, new prop, new carb, new magnetos, new oil pump, and all the other firewall-forward upgrades that were required when I got the new engine. Five years later, I spent \$14,000 on new paint. It still needs a new interior, but that can wait. I spent about \$3000 at West Texas Aero installing speed upgrades.

Budget \$10/hour for your next engine rebuild.

Annual inspection typically runs \$3000 to \$6000 depending on what they find wrong. I'm getting a tank resealed this year, so it's going to be an expensive one.

Parking runs typically \$50-\$100/month, depending on where you are.

Insurance for my old crate runs \$750/year. Expect to pay more for a nicer plane or if you have less experience. Note: get a commercial license; it will pay for itself in reduced insurance in the long run.

I think gas will typically run \$5-6/gallon, depending on a lot of factors. My Mooney burns around 9.5gph, and flies 142 kts so it's really economical in that respect (and the main reason I don't upgrade).

Light twins are cheap to buy, but that's because their cost of ownership is through the roof. A low-time pilot can expect to pay \$12,000/year for insurance and the annual inspection will also be a back-breaker.

I used to have money. Now I have an airplane.