Great well presented post TUBINE.
However there is one point I will take you up on re the C152.
The C152 and A152 are the one of the best training aircraft around. The A152 in particular is a much better aircraft than the PA38 or BE(whaterver it is). It is aerobatic and useable for all modes and types of training flight plus its very strong.
Your comments about size (inside the cabin) are irrelevant, the 152 takes a student of exactly the same size as the other two and its a dam sight easier to get into and out of.
Infact the only thing the PA38 does better than the 152 is visibility in turn. There is a great deal of truth in your comment about the amount of 152s used worldwide for training in comparison to the other trainers, and its because they are a much more popular aircraft.
Personaly, I have a few hundred hours in each one and know which I would rather use.
If it don't fly upsidedown forget it.
Unfortunatly this dose not progress the original thread, but its true. What turbine says is good for everything but the 152 stuff.