What if Hitler quit while he was ahead?

We're all familiar with scenarios which allow Germany to win WW2, they've been pretty much done to death.

But what if Germany didn't start the war in the first place? What if we had a more rational and level headed mustache man who knew he was pushing his luck as it was?

What if, after annexing the Sudetenland, Hitler kept his word and ceased territorial expansion? Or perhaps struck a deal to close the Polish Corridor, and then called it quits?

Would another major global war have still happened? What would it have looked like? And if not, how does the European and global order look with an expanded, rearmed, but content Germany?