For me the cost of owning has been cheaper than renting. This is still accounting for some maintenance issues that I have dealt with. I am also fortunate to have an A&P/IA friend and I will get my A&P later this year (it's on the to-do list) so the "night time trolls" won't have to work on the airplane. I could also run mo-gas, but I have been hesitant with the high temps of S. Texas (vapor lock). And really, avgas is about $3/gal, so it's not too bad. I figure about $30/hour for fuel. I also do not figure into an engine fund as I plan on selling the airplane after a couple hundred hours and there is 1300 hours to go before TBO. I also do not have a "maintenance fund" as I have enough "discretionary savings" for the maintenance pop ups (so far, unscheuled MX has cost about a grand). The insurance is about $800 a year, but I got it while I still a student, so I am sure the cost will come down when I renew. I pay $75/mo for a community hangar, so that is nice and about as cheap as it comes. My break-point for rent vs. own is about 12 hours a month. If I fly less than that, it's cheaper to rent.
On another note, if I was in a locale where I *knew* I would be at for an extended time, I would get into a partnership. I have had a handful of people ask me if I would be interested in selling shares, but I have decided against it because I never know when I may have to move. I saw an awesome deal up in Kansas for a Cherokee 6...$1500 into the partnership, $250 a month for the note and split of the fix costs for a total of 4 people. The plane had low hours TT and TSMOH, new paint and new interior. A very sweet deal...but of course I am no where near Kansas :drool:
Lease backs are a whole 'nother subject that I don't know a bunch about but if I came across a good deal and my lawyer peeps reviewed the contract, it is something I would consider...maybe.