I think you are worrying unecessarily. The 172 is a very strong aircraft and in my experience, spins well and recovers nicely.
I remember having read many times in the past that there had never been an in-flight breakup of a strut-braced Cessna. A quick search found this post by Pilot DAR, who is a well-respected PPRuNe contributor:
http://www.pprune.org/private-flying...ml#post6366874
Here's an interesting maximum load factor comparison:
Cessna 172 +3.8g -1.52g
Boeing 737 +2.5g -1.00g
PS I see that Tarq57 beat me to it by a minute.
I should add that a spin with a properly-handled recovery is a very low-g maneuver.