@Hapsburg: The Habsburgs lost too, after all. However, prince Rupprecht von Wittelsbach was quite popular. Still I'd say that the monarchists *in general* would prefer the Hohenzollern. There were many people around who hated them for being incompetent, but those people generally weren't monarchists.
Gregor Strassor was a rival of Hitler in the NSDAP and one of his major supporters was Joseph Goebbells so it is perfectly plausable that he and not Hitlewr would have been leader of the NAZI partyYou ever read Stephen Fry's "Making History" ? I thought that a very interesting take on a no Hitler idea, that someone else rises to fill the vacuum and his place at the head of the Nazi's. I certainly don't think its impossible that would have happened - after all the German army had to choose SOMEONE to go watch the NSDAP meetings, so this other someone MIGHT have done something similar to Hitler...
Grey Wolf
Without Hitler i would consider a communist Germany more likely than a different right wing one. But Weimar might have survived, too.