@4RNB
If you have the bug, know you want to fly and can find an arrangement that work for you....buy
You only live once and this is something you seem to love. Yes, it is probably wiser to beat up the rental first but when its your plane you are landing in you will fly it even more carefully. Many have indicated the pros/cons. Here is what i see from doing all PPL in my own plane:
1. It isn't actually way cheaper! Why - because when you account for hangar or tiedown fees, insurance and the mx fund for the engine rebuild that hour rate will be more than just fuel. You might think you'll cut the cost in half. And you can if skimp on the mx fund you might. But that will bite you later.
2. You will actually spend noticeably more time at the airport during training!. You need to get it out of the hangar or untie it, clean windows, air up tires, add oil, etc. You are totally responsible for fueling it up which can mean a 30min on the truck or an extra taxi to the self serve pump. You will want to clean it afterwards. I think owning the plane cost me at least an extra 40min or more at the airport each lesson....and I loved it because it was flying related and there was always cool planes on nice summer nights.
3. You comment about not having a hangar for quite some time...did I read that right? That would concern me and really weigh in on the decision to own. Maybe you live someplace with nice temps all year and safe ramp parking?
4. If you decide to purchase, get to know a mechanic on the field. Or better yet by a recommendation that is not biased from the training location. This step could save you major $$$$. This A&P is all that is between you and getting a plane with a motor issue or serious airframe issue. Just because it might be flying doesn't mean is it legally airworthy.
5. One place it can be even cheaper is that you can possibly find a CFI that will fly for much cheaper (ie cash) as you can pay him/her directly without the flight school cut.
6. Using a flight school CFI can actually cost you more than his/her rate in a school plane!!! This happened to me. I didn't mind - the first CFI really knew his stuff.
7. Expect that first annual to be upwards of 10% again of the purchase cost. So for that $75K skyhawk by the time you find it and get the first annual done you might have needed closer to $83K.
8. You talk about the 172 being one of the trainers that fit you. So this could be about your height, weight or both? I am fat and relatively tall. I fit in a 172 but like the 182 a lot more. So if your going for the 172 due to weight - make sure you work W&B numbers with some of your planned future flights during the summer time. Lets say its you, your wife, a hot summer day and altitude. A 172 should work but you might have to leave back fuel, have anemic climb rates, etc. So its about the location and aircraft performance too.
9. If you get serious about a fractional owner, come back and post on that specifically. You would hate to get into agreement and end up in legal dispute - especially with friends. That being said - 2 people sharing a 172 to build hours is great. But 2 people sharing older planes that a bit more capable such as Skylane, Cardinal, Dakota, Commander, Mooney, Grumman would be even better.