For what it's worth, don't be put off by Robinson scare stories. If you fly a Robinson the "Robinson way" they are a wonderful machine. Also, if you can fly an R22, it is said you can fly anything (I made the transition to the 120 no problem although the first auto was interesting!). Throttle correlation is important if you are going to be flying pistons (you will be trained on its use in Robbies) but irrelevant if you moving onto turbines. Believe it or not, I miss flying the 22 (I now fly S61s).
If you are going to hire in future, availability is a very important consideration. If you are looking towards owning something bigger and are looking for the small piston type as a stepping stone, visit all three schools and maybe get a trial lesson at each. The choice of instructor can be as important as the type.