haken - visions, celestial elixir
Came in here to say this, namely Celestial Elixir, which is probably my all-time favorite chorus. Really a lot of Haken's choruses are really good. I don't know what it is about them, but they have just a ton of really great choruses (Drowning in the Flood, Pareidolia, Falling Back to Earth, Atlas Stone, Nocturnal Conspiracy, and just all of them really).
I like a lot of choruses. Often I find bands that have a lot of great choruses. I named some of my favorite Haken ones above, let me see if I can list off a few more.
Nightwish has some pretty great ones: Passion and the Opera, Sleeping Sun, She Is My Sin, Wishmaster, FantasMic, Beauty of the Beast part I ("Oh do you care..."), Ever Dream, Amaranth, Storytime, Ghost River, Song of Myself.
And, though I know this isn't a popular opinion on this forum, Coldplay is a pretty awesome pop rock band with some fantastic choruses: A Rush of Blood to the Head, Viva La Vida, Hurts Like Heaven, Princess of China, Every Teardrop is a Waterfall, Major Minus.
I'll also second Sacul on saying that Porcupine Tree's
Fear of a Blank Planet is a stellar album in this regard (and disagree with him by saying that it's stellar in EVERY regard!). Particularly Sentimental, Way Out of Here, Sleep Together and The Pills I'm Taking.
My all time favorite though has to be Celestial Elixir. That chorus has catchiness, epicness, emotional power and memorability. Those huge riffs come crashing down and Ross Jennings soars with the vocal lines "She may never retuuuuuuuurn... But I will wait foreeeeeeeveeeeeeer... If we cannot make ameeeeeeeeeeeends.... I'll chase your rainbow to the end." This one will be in my head until the end of time.