I'd like to buy the new Nightwish album, since it's really good, but money is a little short. I saw them in concert on October 20th - they were amazing. I like both the old and the new stuff, but I think the new singer is better.
I don't know of anything that is exactly like Nightwish, but as far as orchestra-oriented metal bands go I would recommend: Angtoria and Delain. I would also definitely recommend Epica and Diablo Swing Orchestra, but they have a more operatic style of singing, so if you don't like old Nightwish, you might not like them either. Within Temptation's Mother Earth album is also fairly similar, but their style changed somewhat in later albums. Finally Elis is just an amazing female fronted metal band, although they don't have any of the orchestral styling. Hope you find something you like.If there are more bands that use orchestra like this, and I'm sure there are but I just don't know them, someone tell me some names!