I think that the classiness comes from valuing education. There were plenty of poor Jews in Hungary, but the education was more universal and then in many other places. They also believed in secular education, and that made it easier to make a living.
I think all the comments about chandeliers are cheap shots that have no place in a blog on YESHIVAWORLD.COM. Remember that we have been stereotyped by goyim for centuries. There is no reason to do it to ourselves. If you think that Hungarian Jews are classy, you are welcome to learn from them. If you find the chandelier flashy, don’t buy one, just get a fluorescent light fixture. And skip the nastiness, or at least don’t be nasty in such a public forum. You never know who will read it.