Well, it kind of depends on what it is you like about Delain. Nightwish is still around, but I don't like them nearly as much, especially the last few, which have been kind of mediocre and a poor use of Floor's abilities. Within Temptation too, similar story. Ditto Sirenia. Epica is still pretty decent, though I'm also not as into them as others seem to be. Edenbridge is still around and good, but not necessarily better. The Dark Element is great, though more power-oriented. Visions of Atlantis too, though a bit weaker. Annette Olzon's solo project this year is pretty great. Some love Temperance, Blackbriar, Ancient Bards, and Beyond the Black, they're alright.
Then there are a thousand other symphonic bands, most of which aren't nearly as good, or I haven't familiarized myself enough with them to be sure. If you want something slightly different, there's dozens of different paths to take. My favorite is the other Within Temptation offshoot from their former drummer Ivar de Graaf, Kingfisher Sky. They're much less symphonic and more proggy and folky in a more melancholic way, but I like them better than pretty much anyone else in this thread.