Phone any of the schools. Most are fully booked till early to mid next year. So there are plenty of people with the cash. Know where mine came from, but it is staggeringly expensive.
Perhaps the best question you can answer is where you want your flying to go. Having answered that it may provide the EC135/AS355 answer.
As for schools. Phone them. All have websites. See how busy they are, ask about pass rates, and for that matter any other questions you may have.
If you wait for views about schools from here you'll probbaly get good and bad views regarding all of them, as we are all different and have different expectations
I can only comment about one provider. Whom I'd recommend in a heart beat - that said thats only my opinion
Visit those you are seriously considering, have a look around, ask questions, check course availability, and then decide which one YOU like.
It is a hard course, but it's also passable.
Good luck